chicken has worms and diahrea

[Kiki]

DE does NOT act as a dewormer. Never has, never will. It's not a preventative either. Once wet, it is ineffective and I'm pretty sure if a chicken eats it, it's getting wet. Valbazen is an excellent dewormer as is Safeguard. Both are easy to get. Don't ever rely on ACV, garlic, DE or pumpkin seeds to deworm your flock. Deworming requires an actual anthelmintic.

I agree.
DE can't possible kill worms inside a wet body part.
It's just impossible.
If you read through ALL of this article you will understand just why it can't work.
https://thehorse.com/136694/diatomaceous-earths-deficiency/