Ah, so? General Blue got caught in a cave-in in near the core of the cave, was caught in a plane crash, and was knocked to the other side of the world before ultimately dying at the hands, or rather, the tongue of Mercenary Tao, not to mention Frieza managed to survive being atomized by Goku in a counterattack, and Mercenary Tao managed to similarly survive being caught in the explosion by a grenade he threw in the first place when Goku kicked it right back at him. And none of those guys even had regenerative abilities (at least, none to the degree of the Namekians, Cell, Majin Buu, or even Fused Zamasu in the manga).
Besides, as BrolyKale pointed out, his face ripped apart when even undergoing the Legendary Super Saiyan transformation in the first place. By your logic, he should have died midway through the movie just by transforming.