I have a N=1 for you all.
Last year in March I had CT scan that showed I had fat in my liver. It was in the normal range but, they wanted to keep an eye on it. At the time I was doing keto and then in April I went full carnivore. Which means I ate pretty much only fatty meat.
Fast forward to last Tuesday, I had a liver scan exclusively. I had no fat in my liver and no scarring. That is strong testimony that animal fat that is not used by your body will pass through. It certainly didn't get stored.