"Part of why a low carb diet works is the healthy animal fats that
satiate
you and bring with it the fat soluble vitamins A, D, E and K."

Protein is the more satiating of the macro nutrients.

"There is no reason to fear the animal fats that humans have been eating
for millions of years."

Humans as we know them have been here 200 k or less.  Our ancestors
among the homanids started eating meat some 3 or so million years ago,
as a somewhat minor addition to their diet and many meat sources are
quite low in fat, especially those ungulates of e. africa where they
originated.