I've never heard of a single law or ToS or anything that said porn of humans or anything humanlike is verboten, but porn of humanoid animals is hunky dory. So yes, it sounds more like a wet paper-thin excuse to ban humans and attract murrypurries. Hell, it's more likely to be the other way around, with various laws regarding "prurient" imagery that could interpret drawings of humans fucking as fine but drawings of furries fucking as too close to bestiality.
There are already various people proclaiming FA better watch its ass because, among other things, zomg Inkbunny launched with a search function! Just wait until the first drama with some murrypurry throwing a fit over something stupid, when the mods side with the murrypurry and ban anyone that even implies they might have been in the wrong.