No disrespect to that nina but that's not a nina that's gonna help you against the match up against a top level nina main. He can use any character the way he's using nina here. You need a nina like mine, mistrust storm, victim of ritual. Warning is also a solid nina so that was a good experience for you
You can't say no disrespect then go these people, including yours are better. That's just ignorant. Not a Nina main or even sub but I still have beaten warning in the Nina mirror. I can also tell from your match replays he would not learning the Nina match up from you seeing as in the match your tekken god Nina vs a Kazuya you failed to even correctly input a backdash cancel once (and threw out f3 like it jails).