Ok i've reread the chapter and i've found a few issues with this

Diavolo seems to be in a state of bewilderment. So idk if we can take his words seriously here. How can we take them seriously if he himself is questioning reality? I mean heck he doesn't even know what he's looking at.

And even if we do listen to his words, it contradicts the ability of time erasure. No matter what happens, he cannot interact/attack inside of his TE. So if the TE was still active, why would diavolo try to interact inside of it? it doesn't make any sense at all and contradicts his very own ability

1. It's reality + you are implying Diavolo simply forgot about the limitations of his ability due to confusion. That's an extraordinary claim

2. It's not a contradiction: RTZ activated before Diavolo could deactivate his ability.

It's IC for Diavolo to start the attack in erased time.

When GER says its indeed reality, he's referring to the fact that Diavolo's vision (epitaph) is correct which is him impaling giorno. But the catch is that he will never arrive at the conclusion. He says it in the quote right below it: "YOUR ABILITY INDEED SEES WHAT WILL ACTUALLY OCCUR" which is referring to epitaph.

2. I don't think so. He has explicitly stated that its over and is preparing to connect the attack.

His fist is literally centimeters away from connecting. This is implying that everything is finished (hence the "IT'S OVER!" quote) and is ready to interact with giorno. If he isn't going to end it, then his fist is literally gonna go right past giorno.

1. Yesen't

Diavolo is surprised that someone moved within his erased time, and wonders if it's merely an illusion.

GER not only confirms that his vision is correct, but also that what is happening is real.

2. Yeah he was about to deactivate his ability as soon as his punch was about to hit Giorno but RTZ go brr

Also

It's not the first time this happens

1. Diavolo is surprised because he has no idea what is going on around him. Because of this, he thought that someone was able to invade his realm of erased time but was actually proven to be wrong instead.

2. Yeah Diavolo was about to end time erase but decided nah cuz he saw something happening to chariot. i dont see how this applies to GER as well. His one and only objective was to kill giorno. There weren't any obstacles nearby according to his vision which is why he just directly went for the kill. I don't see how that scan helps you when they are literally in different scenarios.

Especially when diavolo literally claims that it is over. Meaning that he is straight up going for the kill without anything halting him. Vision in epitaph confirms this unlike with chariot where he wasn't expecting the arrow to requiem itself

1.

Yesn't. The surprise mainly comes from the fact that someone is moving in his erased time

He was never proven wrong.

Your main claim is not enough to prove such extraordinary claim.

After all, you have to prove Diavolo suddently forgot about the limitations of his ability.

2. Except in this case RTZ prevented the ability to end.

As long as you don't debunk Diavolo's claim, you can't argue RTZ worked outside TE.

I tend to use this as a "High-Ball GER" and a "Low-Ball GER". GER in it's High-Ball activates automatically and within erased time. That's the most commonly believed GER. Low-Ball GER does not have automatic abilities, and cannot work in erased time.

However, the fact that Giorno is implied as to not have any idea of what's going on, and the fact that Diavolo specifically states that it's erased time should be counted.

So, for now, I would assume it's very acceptable to believe the High-Ball GER, especially considering he never showed up again and all we have of him is what we have. Further, his speed stat is Null, which is due to his speed being above the stat capabilities of the stand measurements. And that measurement can include infinity. This means that GER's speed, either physically, or ability-wise, has an activation speed beyond infinity, and infinity is essentially immediate. It's why Instant Transmission is an infinity speed. GER's activation speed is faster than instant, likely meaning it doesn't even require time.

Regardless of what the mass opinion is though, for the sake of argument, let's use high-ball GER, as that's the one that appears to be the best supported by the manga.

1. He was proven to be wrong as diavolo himself claims that its over and is literally preparing to deliver the final blow. Ok, lets just assume that time erase is still going on. If thats the case, then diavolo is just gonna punch right past him. You see how this contradicts the narrative? He HAS to end it before actually being able to interact with his opponents. If TE is still active like you are saying, how is his attack going to land?

2. He prevented the attack from connecting yes that is correct. If GER can function in erased time, then why didn't he do anything against the blood slash throw?

Diavolo has been shown to effect people in Time Erase. When Bucciarati is escorting Trish to the tower, Diavolo skips time in the elevator, cutting Trish's hand off in the process. In the Colosseum, time skips again, and when it continues, Narancia is killed, put on the bars. And finally, the last one is IN THAT SPECIFIC TIME ERASE. Diavolo throws his blood to blind Giorno. The misconception is that Diavolo can never touch anyone in time erase. He obviously can and has. And even if he couldn't, him shouting "It's over" doesn't mean the Time Erase has ended. It is the same as what Jiren says. "It's over" means that he has declared victory, something he obviously did early, because he was wrong. There's nothing in the manga saying he ended the Time Erase yet. None of this disproves the fact that Diavolo states himself that he's still in Time Erase.

If Diavolo is able to cut people's hand during TE, that would just straight up contradict the entire point behind time erase. time is erased, nothing exists inside of it. This is shown and proven to be correct when aerosmith bullets directly passed through doppio's buddy. So diavolo cutting trish's hand during TE is 100% headcanon and isnt backed up by any source.

When he shouts that it’s over, yes it means he has declared victory and is preparing to deliver the finishing blow hence the "it’s over!" quote. but before the attack properly connects, he needs to exit the TE for that to happen. Otherwise, hes gonna phase right past giorno

"There's nothing in the manga saying he ended the Time Erase yet"

But ok. Literally tells you that diavolo is planning to end the TE in a matter of seconds. So it completely goes along with the narrative that diavolo needs to actually end his TE for the attack to actually connect and not just phase through. Saying diavolo can attack during TE is just straight up false and headcanon