yeah i got the feeling it wasn't a deal breaker or anything and you are right that if they could they would have dialogue for both but it's too much work. but i have been around the block enough times to know it is a whole legal thing about putting incest in.
granted i don't know why itchi and patreon don't use an equal hand for all things like that but i have seen a fair share of them either be deleted from the platform or have to edit the game in such a way that their is enough ambiguity. a lot even do it just to not take any risks at all cause it's an easy addition at the start and cuts off any drama.
most that have issues like that will tend to use an "unofficial" patch that weirdly lines up perfectly since they already have attention on them.
kind of in the same way you might see react channels on youtube using the legal 10 minutes of a show but still fighting strikes all the time but only for certain properties.
i even took a quick peek on their rules and guidelines for adult content just to be sure yes depicting incest is one of them at least for patreon anyway.
i'm sure the author has no issue if you would rather them not be incest and being able to pick that but that being one of the fetishes they are going for it has to be pretty explicit in the dialog and they can't have it both ways.
all i'm saying is i have yet to see a game where where they use the set your roommate's and landlady's role and not have the dialog be clear it's incest. so going in without those expectations is wishful thinking on your part.
i feel like i'm going a bit overboard with this cause at the end of the day i don't think anyone is truly upset here. just thought it was odd that you would think that meant other wise and wanted to clear that up.