Disclaimer: this is purposefully obtuse.
Other effects in the game which explicitly state they kill you:
Shadows, succubi, massive damage, death saving throws, beholder death ray (notably not even their disintegration ray kills you), power word kill, vampires, mind flayers, night hags, drow inquisitors.
Clearly, if they intended for disintegration to kill you, they’d have said so. Since specific overrides general, and there is no general rule that disintegrated creatures are dead, I rest my case. QED.
Ok, disintegrate transforms you in a pile of tiny objects if you get down to 0 HP when hit
No? As I just said, the spell doesn’t mention anything about changing your type.
Going from
creaturetopile of fine gray dustsounds like changing to me