"I can't confirm any rumors. I'm happy doing what I'm doing. I have no interest in going back to coaching"

Jimmy Johnson is likely referring to reports that he is considering a go back to coaching. He is making it clear that he is content with his present scenario and has no interest in going back to training. This might imply that he is satisfied with his current task, or that he is retired and enjoying his free time. It might likewise mean that he is not thinking about the training chances that have actually existed to him. Whatever the case, it is clear that Jimmy Johnson is not interested in returning to coaching and is content with his existing situation. He is likely focused on his current task and is not amusing any offers to go back to coaching.