I don't like the part where he writes about replaying it from the start lol. I hope there won't be a choice that will be that crucial that you need to replay it way from the start.
Ep12 won't come out until 2026, lol. You have tons of time ahead of you, lol.
It could be something like the stealing of money in Jill's room way back in Episode 3 had a potential strain to put on the relationship many episodes later (can't remember if it's Ep. 9 or 10). When a variable sits dormant like that without being used, it can be hard to remember how to code it and wasn't checked to make sure it still worked out correctly in the current Episode where it comes into play.
Not sure if you'd have to play through the entire episode to check it (I'm not a coder, so I don't know if you change variables willy nilly in the code while playtesting to just check that one thing or not), but he is a perfectionist, so even if he could, I'm guessing he'd want the full experience to make sure something else doesn't affect it.
The first thing that comes to mind and that can affect your relationship with your girls, which happened already in the first episode, is accepting Quinn's proposal.
Probably the second is whether or not to beat up Troy.
Maybe the news that the MC is banging girls and paying them to do it could potentially upset for example Maya who hates Quinn. And then there's Sage.
Maybe the fact that you didn't fight Troy will cause Chad to become your ally.
Overall, it feels like the game is at the “gathering allies” stage, which happens in all final chapters of all games before the final battle.