She is right on one thing Animal Protein does help your birds. But you can use it as treats. Leftover scraps from the kitchen. Our feed store sell fish pellets for $18.50 a 50# sack. Thrown as treats in the winter it helps reduce food consumption that goes way high during the molt when they need the extra protein to grow feathers. I gave my chickens killed stuff from around the place and they like that. You got to cut it open first or they don't know how to start on it. I gave them a snake and butchered deer carcass and they were like, oh no, too much for them.
Although, I have watched other videos and was like "What?"
I have an OCD managed flock -


I served this flock 3 deer carcasses this winter near Cadillac, MI. They devoured them and are picking the bones now as the bones are exposed as the snow melts. Birds will eat anything dead or alive IF it can - even its own if they deem it necessary for their own reason. The lady in the video is avian/poultry ignorant and throwing darts in an effort to earn advertising monies.