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.
Get the feeling it would be difficult to have a dust based strength character though. Hard to hold weapons/make attacks with them as dust.
Maybe wizard?
“As you cross the street you take 1d4 of wind damage. Please make death saves.”
“it starts misting as you are traveling”
Roll to not get washed away
Due to the failed Dex save you have been dissolved. Please make Con saves for drowning.