Lore or in-universe explanations usually don't get accepted as a valid reason, same with the loli that's actually a 1000 years old vampire or something like that. The reason why furry doesn't fall unter bestiality is because those two categories are distinct enough for most people, it's as easy as that. You can argue your brains out about this all you want, it won't change a thing.
Patreon's enforcement of rules seems arbitrary and random, yes. But this just means that you're better off being more careful, the feral kerpali model could easily be spawned in and talked to like the other, non-feral kerpali but there's obviously a risk involved here and if your entire livelihood is on the line, why take the risk?