NTR is cheating. Full stop! Within NTR you have sub-groups. Voluntarily cheating, blackmail, rape, drugs, mind control etc.
The reason people want to subtract NTR from cheating itself is: When their MC cheats with multiple characters it's not NTR! But if the chick cheats, it's NTR!
That being said, I am not a fan of NTR. I avoid it if possible. And there should always be an option to avoid it, unless the whole premise of the game is NTR.
I think the dev buckled under the NTR fans pressure, and hinted at it, forgetting that a large group want nothing to do with it. I would imagine he didn't think a dream sequence would have such an effect.