I feel like the story of what happened to the patch has gotten more and more extreme each time it's told.
All we really know is that the dev didn't write the game with an incest patch in mind, so sometimes the patch has bugs cause the patch maker has to manually change
everywhere the MC's relationships are mentioned in the script rather than just setting a variable, it so happens that this time the bugs are so bad it's completely broken. It may get fixed at some point but it may not be until the next update.
I haven't seen anyone but you
Demoness_Kiss say that the patch maker quit, as far as I know the patch maker has never identified themselves so idk how anyone would know if they did quit, so unless you are the patch maker I don't know where you're getting your info from.
I get that you're just trying to be helpful but you're gonna end up confusing more people at this rate.