He was kicked out because he got busted for cheating, and iirc ND's handbook says that's immediate dismissal from university with potential for reapplication. Is your surprise stemming from the fact that as a football player he didn't receive any SEC-like treatment? I don't know if he will be readmitted, but ND better hope to hell he does because their QB depth is atrocious.
Also funny: an ND booster is picking up the tab for all of the training and camps he's done this fall. Since he isn't enrolled in a school, this isn't an NCAA violation.