The only thing in there that's relevant is the Tweet from Patreon saying this;
We'd like to clarify a recent rumor about our guidelines. We do not limit any specific style (like anime) of art. But our guidelines do not allow sexualized depictions of minors.
Everything else is a bunch of anime fans and artists making mountains out of molehills and building straw men to scream at.
Anyone who had to delete 90% of their work to comply with this was a child pornographer who was using an anime style to try and give himself a tiny bit of legal wiggle room. Or clueless and not understanding the actual rules. I'll allow that much.