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.
I haven't ignored anything intentionally, if I haven't addressed a supposed claim to why this isn't RAW it's because it was added in an edit after I replied.
(psssst, read the first line of the OP)
The first line of the OP does tacitly say that you're arguing in bad-faith, yes.
Tough crowd!
I agree. People are getting all riled up for no good reason.
I think you're hilarious.
OP: this is purposefully obtuse Other people: engages with OP OP: is purposefully obtuse Other people: shockedpickachu.png