It's the payment processors that's causing the problem, not the platform. They are the ones getting uppity paying out devs that earned money they've made by creating an incest game. Credit card companies threatened to leave if incest was going to be in a game on that platform. It happened to another dev with his game that ended up getting banned from Patreon, I was around when that happened. So they are watching devs to make sure they play by the rules -- be that Discord, Steam, Itch, Nutaku, etc... including F95 (I heard this personally via several devs).
If you actually paid attention back then during the development of MotH, you would have noticed we didn't refer to her as anything other than by her name. We've been doing that on Discord since the time I joined the team 6 years ago. Same applies to Julia in MwM.
So... a patch can be offered for those games to change the relationships with/to the MC. And as was mentioned before are, "fan-made" patches. As such, the dev (in this case, Faerin) doesn't support them. That doesn't mean you can't use them, just that we don't want any reason for Faerin or his games to get banned from Patreon.
Yes, I'm well aware that in some Ren'Py games, the dev gives you the option in-game to change that without the need for a patch, but why take the chance? Why poke the bear when there really is no need to? Especially if this is that dev's livelihood.