It has nothing to do with patreon, this guy has been delaying releases since the beginning, and with each delay his excuses get worse. If it had anything to do with patreon rules he would have said so. Plus, he already has a workaround since you name the characters yourself and choose the relationships and there is technically no incest in the game. And he has his own donation system on his website.
Nothing to do with patreon lol, he's just milking his subscribers, look how much money he is making after a year of no content. Why would he regularly release the game? That would shorten the development time and decrease the amount of money he makes. As long as his patreon supporters don't unpledge, like they haven't so far, he stands to make a lot more money purposefully delaying releases like he has been doing.