I will be honest to me he should just apologize and stick with his job, what happened in a time before “Saved by the Bell” was aired should be left in the past as long as he apologizes and moves on. I am not for judging a persons complete life by something that happened over 30 years ago. It would be different of course if they start digging up more stuff right and left and even worse more recent.
His worse mistake (imho) was backtracking by saying it was him, then saying it wasn’t. He should have just apologized and said it was a stupid thing and it doesn’t represent the man he is today. And that should be it.