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.
The rules also don’t state that being incapacitated impairs movement in any way, dropping to 0hp is stated to incapacitate you. So you can just move away at 0hp.
Obviously we have DMs who aren’t robots and will play to the spirit of the game, not the word of the rules.