He's traveling to visit a classmate.

I imagine the rules might be different if he had enrolled somewhere else.

That would no doubt be ok, but if the University pays his way and covers his room/food that would seem iffy, but I guess not.

Otherwise no way would Texas compliance let him go as much as he means to the success of Texas in 2019. No way they risk any penalty. But clearly it's not just him visiting with his teammate.

anyway, so he may well have paid his own way.