No one is redefining them. It's just a simple mistake that needs to be corrected and addressed at some point.
It's tolerable, at least not too generic.
I wont be playing the game so I dont know about the plot but I did play the dev's previous works to know that theyre your typical simple ntr with simple plots. No developement effort. Basically one of those ntr shovelware games.
Eh, shovelware games aren't bad once in a while, like junk food. At least, as long as you don't pay for them. >.>" I'm not one to support shitty business models after all. Especially with hentai games, I only support the devs that put at least some effort in their content.
Guess I'll check for myself at some point if the art is at least worth a laugh.
As for the NTR debate... Thing is, NTR, or rather, specifically netorare, though this applies to the other two as well to some extent or another, has been around for a looooooooooooong ass time, much like a lot of fetishes. Unlike fetishes like bestiality or tentacles, which are specific and can't really change because they refer to specific things.... ntr depends on context. The literal meaning of it is "to be taken away", and that implies two absolute things. One, there's something, or rather, someone, to be taken away. Two, that something, or someone, belongs to the person that they're being taken away from in some capacity.
Obviously, you can't 'take away' something that doesn't belong to anyone. If you buy the last roll of toilet paper in the store, you're not NTR-ing the people that also wanted toilet paper.
That's why, in the bad old days before VNDB, dlsite, and social media as we know it today existed, netorare really was all about actual established romantic relationships of some kind. Because that's the only way that the person that's being stolen belonged to the person that they're being stolen from. Otherwise, there's no claim.
As things evolved and fetishes became more accessible, more people started to define and redefine those fetishes that aren't based on hard details.
Netorare is... in my opinion at least, a victim of that. In the sense that it's been widened to the point where it's meaningless. Pretty much everything falls under netorare in some way or another these days, even if it's as simple as a girl merely giving a handjob to some dude that she hates for one singular scene and she's disgusted through it all the way.
People kind of forget that a key element of netorare is 'to be taken away' and thus also, true betrayal. That there's that point of no return, where the other person is genuinely taken away and nothing the one they're being taken away from can do anything about. It's why random rape should not be classified as NTR, because while it obviously sucks to have one's significant other raped under one's nose, the couple can get back together after that and still find their happily ever after. Netorare is irreversible. It's the bad ending. It's that line that's crossed that can't be uncrossed. It's the final willing betrayal. It's the failure of love in face of pure lust (and sometimes magic/super-science/whatever).
So while I agree that the definition IS broader these days... it definitely didn't start off that way.