Well she could do that.
The problem is if Vlad acted on it and then Nixon took the AFL to court, then Vlad would not be able to produce the video as evidence.
He would be forced to admit that he is relying on a self confessed liar's word for his dismissal. Nixon's lawyer would have a field day.
Vlad wouldn't have to reference the girl or the tapes at all if he was to revoke Nixons licence. The AFL isn't a democracy.