Hopefully this reply doesn't get me warned/banned (I'm not disparaging Patreon or DC), but this post is not exactly about help with the game. I am speculating on the game's development though, so hopefully it's still appropriate for the thread.
DC can only say that he's patching stuff out, right?
I mean, if Patreon were to listen to a Picarto stream where DC said, "Oh, yeah, we'll make it so you can patch the incest right back in by X means," they would take him to task or ban him. He also can't write that intention anywhere, even on his DC site/wiki if there is a formal affiliation with his Patreon page.
He has no way of notifying fans of incest-restore patching, at least of which I'm aware, without running afoul of Patreon re: his intent to come into line with their policy, because Patreon could see/hear the (theoretical?) non-truth he made to them about getting rid of the incest in Summertime Saga.
That said, I agree with whomever speculated above (sorry, didn't include the quote), that he could anonymously release the incest-restore patch himself, here (I presume) or elsewhere. At least until he frees himself of the Patreon tether.