Nothing wrong with what he said, and he probably felt the need to clarify because of how his last announcement went.
He got a lot of hate for it (understandably), and got even more when Coach went to the hospital- had some terrible comments sent his way, which is not understandable. People telling him he may have caused the distress, etc.
At the end of the day- it’s a kid wanting to play in a system that he feels gives him the best chance to go pro (whether we feel like that is attainable or not). He got mad and made a poor decision to publicize it. It does not mean he hated Coach or wished him ill, which is what he wants people to know. I’m sure he feels awful about how they left things.