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.
That's probably the path I'd take as a DM if I had a player insisting on rules lawyering like OP. OK, you get to "play" as a pile of dust. Have fun sitting there until random wind currents blow you around.
Crappy party mates you have if they won't even scoop you up into a bag and carry you around.
buddy let's start a campaign together you can be the pocket sand and i will be dale gribble
Shashasha