No Tressel involvement here in the slightest. People, aside from halftime interviews ... he is university president and nothing else.
Tressel usually does not involve in something like this. Discipline of students is up to the committee including students and faculty members.
The committee could have handed down the discipline for him to sit out the regular season during the Fall semester. If post season games are considered to be outside this window, he might be allowed to play if he is officially registered for the Spring semester. The registration for Spring semester started 3 weeks ago starting with student athletes, student employees and Seniors. It is possible that he has already registered.
As I said, I am just guessing.