NTR, as a tag, doesn't necessarily mean that the MC gets NTR'd. It can mean that there is elements of NTR and cuckolding in the game.
There's a lot of games with a male MC that is a bull and steals other men's girlfriends that is also tagged NTR, and if the definition works there then it should also work here.
Additionally, there is also storylines in the game, under specific choices, where other characters could steal our MC's love interests. Leo has Julio interested in them, and Eva has some suggestive scenes with Yara. While these are not your partners as of writing this message since that aspect of the game (committed relationships) is introduced in the coming update and the decision for it has been implemented in this one, it is still an aspect of NTR that is included in the game.
All in all, with all these reasons, that's why NTR is even a tag in this game.
As a side note, I also like NTR games and would look for a male protag NTR game for my own pleasure, so maybe I can suggest to try out mixing these two tags when looking for something a bit more targeted to your likings?
I just so happen to be writing something that isn't usually seen in this kind of games, NTR from the woman's perspective, exactly because of the lack of content in that regards <3