A couple points of interest here
MHJ is not doing any testing Combine or Pro Day. Thats a bit new for me
According to this sports illustrated article Combine Officials already knew he wasn't going to talk on the podium.
"Harrison broke his silence by reposting a tweet on X, formerly known as Twitter, from Shane P. Hallam of Draft Countdown that implied combine officials knew conversations weren't going to happen."
However he did do some individual interviews directly with clubs. Basically he is dealing directly with clubs and leaving everything else to the film. I can't be mad at that.
https://www.si.com/college/ohiostate/football/why-didnt-ohio-state-buckeyes-star-marvin-harrison-jr-speak-at-combine