Sorry but you are wrong. The game has NTR that's true, but it isn't a NTR focused game, in fact Aleksey said he doesn't like NTR but will make a path for those that want to be friends with Eric, but that in the end things will get ugly for one of the two, aka a bad ending or Eric gone from the game. So yeah it has NTR but the game is a non-NTR one focused on INCEST with a small path (in the long run) for NTR involving Eric.
People who comment here are varied, some like NTR, other don't, there are paths, but this is not a game made for the NTR, if it was the case there wouldn't be choices and paths, so try to not generalize. The game is/was/will always be an INCEST one, since the MC is Max who is trying to fuck his family, no matter what people like you that like Eric and NTR think, this game is an incest one, not a NTR one, so there will always be people interested and or waiting for the time to get finally rid of the NTR, aka Eric, and to progress to the real part of the game, fucking your family. So to me it's like until Eric is out of the game is the prologue with forced NTR with the mom, and the "real" game "starts" after that.
I will say it again, based on what the dev said about the Eric friend path and NTR, it will result in an bad end or at the end you will have to deal with Eric too, so yeah, not much for a "NTR" game that you claim it to be.