Wait is this really an issue? It’s not like it’s some petroleum product, it’s always some kind of vegetable oil, right?
Animal fats also compost reasonably fine. I think most come from cheese that is milk fats or from meats. But none of those should be any issue either.
Reasonably fine for large scale/municipal composting. Last time I checked there was a lack of strong consensus on whether animal fat always composts well in someone's backyard composter, so YMMV. But the reply was really poking fun at the idea that pizza fat (outside of strict vegan pizza I guess) is exclusively plant based.
It is when you order one with cheese. Or with pepperoni. Bacon. Sausage. Etc. Etc.