From my time as a patron of xRed, there weren't people expressing rage over the dad scene on the patreon page. There was however, a loud group of people screeching on F95 about it, even though it wasn't NTR. How dare there be another dick in the game! There was alot of issues on the discord and patreon page, where people were getting tired of lack of progress and lack of updates, which is more likely the cause of the decrease in patron growth.
Then there is also the abandoned game, which actually had NTR out of nowhere, which made people mad. That surely had an impact on the patreon page, but it was a long time ago.
If they want to make an NTR game it's all right. I don't go into "hotwife ..." or "cuck simulator" threads and complain about the female LI getting banged by others, i don't even go in because i know that game is not for me. As i understand it (got a little late to the party) because issues on past games from this studio, they explicitly said there was going to be no NTR in this game. And two minutes into the game we get to see one of the main characters that can be reasonably be expected to to be a LI getting banged. Then the usual shitshow happens in the forum and they start with the "akchually it is not really NTR because...". If you are not making an NTR game, how hard is it to not have one of the LI getting fucked by some other guy? Just don't even go there and you save yourself all the drama.
Now they gut the game and all of its plot and blame for it the anti NTR crowd, "look at what you made us do!". "He is her husband how are they not going to fuck?" Easy, he cheated a while back, she is still angry at him and they are having a dead bedroom. Now you can keep the dude in the story as an antagonist to the MC and you avoided the NTR issue. I am hired as a writer now xred games?
It's like complaining about having clear windows in a car and instead of tinting them, you take them out, and after that "brilliant" fix blame the one that complained about how now whenever you drive the wind is unbearable and you keep swallowing bugs that the windshield should have kept out.
Seriously, if the only way your writer has to keep the story engaging is having the LI getting banged by other dudes, you should get a new writer.
But that is not really the issue, but that it seems like they are making games for a public they hate and actively try to anger.
There is a public for NTR games and they certainly have the skills to render beatiful girls, go do that. Because as it is, they are not happy and the public is not happy.