Well they did finish lower than Nebraska with final 4's on their resume in the very recent past.
Thad Matta is an elite college coach, I truly believe that. I don't think his health issues are that hidden anymore and I bet it was starting to hurt recruiting. Dude is 49 years old, looks over 60. Probably could use time to step away from the game for a while. I would guess this was mutual and Ohio State "fired him" for contract reasons.
If he got healthy, I'd hire him in two seconds.