That hasn't stopped the many stories of yukkuri dying from powerful odors, drowning, suffocation, and any other lung required deaths.
And the story continued and ended without them so yes they're dead.
"powerful odors" could just be the negative smell. The sour/ripe smell, the same strange stench that comes from their poo-poo and pee-pee. It's possible it's a bacterial thing.
Drowning? They dissolve.
Suffocation? Still don't understand that one, but usually if they suffocate, they die from something else.
Wait, maybe their still alive, they say that just after you die... *Sees bodied Reimu poo herself* Oh, nevermind
O, ok...The Reimus only took their eyes off the children for a bit, and then this all happened...Oniisan, listen to Reimu okay?
Reimu is now very very sad you know?
But, having said that mister food is an entirely different matter. Understand easy?Reimu, it's time to ea...
Well, not like I don't understand your---I'll eat it!!