Since they allow games with adult content, it doesn't make any sense that someone at Patreon would have directly told him to remove all of it. At the same time, apart from the blatant incest, they probably weren't able to draw a line at exactly what constituted an underage-looking character - because how can you?
So while removing it may have been the only way he might have been reinstated, since they also don't allow off-site patches to add content they disallow, the whole plan was very obviously never going to work to anyone who wasn't irrationally desperate to retain their supporters on the best crowdfunding platform.
Put yourself in the Patreon rep's shoes - if someone rewrote their game to become such a ridiculously stupid parody of itself, and plans to patch it off-site were already on the public Discord before the appeal was resolved, you would correctly think they were insulting your intelligence. And if you were that Patreon rep's manager and they asked you what they should do in that situation, you'd probably tell them just to ban the dev permanently and cut off all contact instead of dealing with such a blatant bad-faith actor any further.
He went ahead with such an insane idea because he's greedy and thought he'd lose money going to another platform (it was only temporary), he's stubborn, and he thinks he's the smartest person in every room he's in - not because anyone at Patreon promised him it would work.
He treated the people at Patreon like NPCs and got rightfully burned for it. Nothing more. And he felt so personally aggrieved at the situation that it's enshrined seemingly forever in an event inside of his own game.