Just to butt in a bit... as someone else who's also worked various jobs in food service and management. I think those practices rest solely on the shoulders of management.
It should be the managers who are removing expired items as they do inventory, and it should be done at end of shift, the...
Chickens are birds.
Birds can't handle fat the way mammals can.
These are not "natural" birds either, eggs take some of every nutrient to produce.
Also, I disagree that grinding and pelleting fits the definition of "ultra processed". It is simply processed.