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.
Fine dust does not have the consistency of chunky salsa, so it checks out.
I’d like to imagine that this is how non-necromantic sapient undead creatures are created, someone has all their flesh incinerated away but somehow their soul clings to the bones, and bam sapient skeleton.
In this case it could result in a poltergeist, which uses the dust to interact with things.
I’m just going to swing for the fences with the always objectionable, “fiction trumps rules.”
You’re not dead when you’re petrified, either, which can lead to some pretty interesting exploits, rules-as-written.
Petrified creatures count as creatures, not objects, so rules-as-written you can determine if a statue is a petrified creature by trying to target it with a spell that requires a creature for a target.
With the cantrip Poison Spray, you can check for petrified creatures without using spell slots or risking damaging the creature, since it would be immune to poison while petrified.
If you want to go absolutely strict RAW with the creature/object distinction, resurrection spells don’t technically work. They target “a creature that died”, which, by an obnoxiously precise reading of the rules, can’t exist. After they die, they’re an object and not a valid target.
I don’t understand why they can’t just make “dead” a state a creature can be in.
You can also safely check with Vicious mockery. The spell can target any creature, but only damages the target if it can hear, which “inanimate” things cannot.
On the other hand, Dissonant Whispers causes the target to hear (rather than hearing being a precondition as it is with Vicious Mockery) and with this you can kill petrified creatures, thus ensuring no spell casters return them to flesh-and-blood, without damaging the statue.
This is straight up horrible. LOL, party goes on a mission to obtain a cure for petrification to save a bunch of statues only to discover that they are all a bunch of corpses because the villain is just that big of an asshole.
