It does make sense, don't worry.
Thing is, there's a lot of beef between the people who want all games to have NTR, and those who don't want to psychologically torture themselves with every new game (guessed which side I'm on ?), and the latter tend to get pissed off to see people coming in every thread with a "when NTR added????" and a "game needs NTR". It's more common than you'd think.
The problem is in the labeling, since NTR is basically girlfriend stealing right in front of you, often by absolutely unsufferable characters. With how you explain it, it doesn't seem as much NTR than more of a... corruption route, I guess ? If in that route the MC isn't romantically and emotionally involved with the girl, unless you focus the narative on how much it hurts him to see her get fucked by others, and her saying he can fuck off because the new guy(s) fuck her so much better and she wants to be a slave to his/their dick(s), then it's not really NTR.
Although you'll attract more people saying there is NTR, you might also see them pissed off at the lack of suffering, since that's apparently what they get off to, I guess ?