As others have pointed out, NTR is when the MC is in a relationship or have romantic feelings for someone. Neither of these things have happened at this point of the game.
That site's userbase is just hellbent on nothing else can do anything expect the MC as they love to inject themselves into the game, same reason they get upset when you can not change an MC name.
Many characters in heaps of games have sexual experience with others before they starting dating or having sexual activity the MC.