If he were doing something other than what Tdiddy asserts, he would have resigned.
That he hasn't resigned shows that he's not interested in integrity or accepting the consequences of having been a terrible coach. He's interested in brown-nosing. Maybe he's being honest: maybe he actually went back and determined that he had done a bad job.
But talk is cheap. When he wakes up one morning, walks into Jack's office, and says, "In light of my unacceptable performance as this institution's head football coach, I must tender my resignation," we'll talk.