Long time forum viewer, 1st time poster. I don't have access to the premium boards, so am certainly missing some details some of the other posters here may have (although it sounds like there hasn't been much in terms of concrete information).
All that being said, and this thought is all speculation, I do remember him having issues with COVID compliance a while back. ND is also requiring its students to be fully vaccinated for the fall semester (with the exception of a few religious and medical exemptions). Perhaps he is refusing the vaccine or some other measure of COVID compliance. We are getting close enough to the fall semester where the issue of not being vaccinated would be coming up.