Time for a needlessly long post about a single scene!
So I played through the game (which was alright, though still very much in the early stages) and got to the notorious scene in question:
Its not NTR within the context of the game, but it does hit a common NTR tropes of a women being coerced into a sex act by another guy while the MC watches. However textually the MC does not like this women, and actively malicious towards her in the game and is using this one sex act as a way to get revenge on her.
If this happened later on the story while you more than just rivals or the MC continues the story by forcing Wanda to do sex acts with other people than we are entering a territory where calling it NTR (Or atleast in the same cultural space as NTR if not textually NTR) it wouldn't be inaccurate. It'll really come down to what future updates have in store for this plot-line and it feels to quick to assume the worst from a game that is pretty new.
Now does this scene rub people the wrong way because it means that this game is not really a super clean, straight-forward Harem Fuckfest? I think that criticism is warranted, though it'll really come down to if the dev (devs?) want the game to be that in the first place. if they want to add complexity to the narrative and make the harem messier before ending it with everyone together I think that'd be really cool, but it's important to know that by going down this route you will lose people that want the game to be The MC One-Cock Carousel. You can't please everyone so just go with what you believe in.