BS”D
No reason to believe that FeifUn is a snitch chas vesholom, only that his views are clouded by secular values which is very far from being a Philip Schein or Solomon D-ek.
Mesira is probably allowed in cases of pikuach nefesh which could include child abuse, spousal abuse etc but NOT in cases of even real, let alone imagined, chicken abuse. Ask a legitimate posek before you even think of going to the authorities in any case whatsoever.