I see, the truth is that I haven't seen this game for a while and I was surprised to see "the tag" now in a game that clearly has completely different connotations, however from what you say it's more of a background for a specific character, and Because of the way you put it, it is true that this does not count as ntr, yes, surely many will be uncomfortable with the situation, but in real terms the MC is not spying on how she has sex with another boy just to get off with it.
Thanks for the clarification, we will have to wait and see what the dev does since the damage has already been done (for some), personally as long as it is more for the background of a particular character and does not affect the rest I am satisfied.