I'm not a big fan of Elaine's past either, clearly overkill with the rape + gangbang for years that turn her into a nympho but I don't see where the ntr is in this story.
The mc is not in a relationship and has no feelings for Elaine at this point, at best Elaine is starting to have some based on what Wendy tells us (if I remember correctly) but they are nothing more than fuckbuddies so even though I'm not a fan of this part of the story and I can understand why people are upset with that, even if she fucks another guy, technically it's not ntr.
Then apparently this part is going to be changed even if for those who follow since the beginning the damage is already done for the character unfortunately.
I agree I don't think I would call it ntr, but it comes sorta close because she was apparently with that guy in a very close time period to when she was with the MC the first time, within the same week at least. It just kind of made her somehow come off even more slutty.
It was her overly extreme background that ultimately ruined her for me. It wasn't bad enough for her to be a rape victim, she also got gang raped and then she became a nympho because of it. For me it was just a lot to take in and I agree it felt like overkill.
Dev said things are changing though so I will reserve further judgment till I see what he comes up with.
Also, for anybody else, is there a difference between LI and a fuck buddy? Is she not someone who is supposed to be considered a LI or a future LI? Just curious, because I get that atm she is more of a fuck buddy, but I thought it came with the potential to become a LI later. So, was I wrong in thinking that?