Those people who coined the term shifted it to the way what you replied to. The moment they made simple crush being fucked NTR, it was done. Throwing around the original meaning when it changed tenfold since then is rather pointless. Also you're examples were highly contrived, for the sake of your argument, but I guess you know that already.So by this defintion
Sure. So by this definition, a game with a chad protagonist who looks to cuck a bunch of husbands by getting with their wives, is an ntr game if it shows hubby and wife fucking at any point. I mean the sensitive psyche of the player controlling the chad might get hurt and evoke some jealousy... Despite controlling the character who will get to cuck said husbands.
Or in an incest game, if daddy and mommy are shown to fuck, like married people are supposed to do...are they cucking their son in an ntr game?
Japanese people who coined the term, long before wegs were a thing, would be having a stroke right now.