Right, and "committed" has two meanings. One meaning is describing your attitude towards something, or your mental states. It says "I have committed, or decided, to do this".
Another meaning is local and descriptive, and just states what you have done in the past. In this sense "committed" just means "I told Ole Miss that I would sign with them on Wednesday".
The second sense is uncontroversial. He *is* committed to Ole Miss. If he meant this, then we have no reason to be concerned.
The first sense is controversial. It would say that he still intends to sign with them. But, we have no reason to think that he meant this. Think of the conversational context. If Farrell asked him who he is signing with, a one or two word answer is sufficient if you want to be crystal clear. You say "Tennessee" or "Ole Miss" or "Don't know". But, he said "I am committed to Ole Miss" a clearly ambiguous phrase, that serves to *sort of* answer Farrell's question while still leaving it open what he intends to do, or what he has decided to do.