Here's a link to a good Maize n' Brew article explaining the known facts and what Michigan law is on unauthorized computer access: https://www.maizenbrew.com/football/2023/1/18/23560337/matt-weiss-police-investigation-michigan-wolveirnes-university-police-department-computer-access
Seems unlikely he would use a University computer to commit internet crimes since he could do so from home with more anonymity. The house search is curious but could be because they want to show he has items on his home computer that were illegally obtained from the illegal access to the university computers. What that might be is anyone's guess.