It's both.
Tennessee wants to fire Jeremy Pruitt because he is not a good football coach. When they got wind of potential NCAA issues, they hired a respected and thorough person (Glazier) to find dirt. When he finds something, anything, they will use it to their advantage.
Pruitt will then sue to argue he should still be paid his full buyout. UT will say "this wasn't our investigation, a third party found all these issues."
The truth will be somewhere in the middle - both parties will settle at some point.
So you're repeating back to me what I've been saying for weeks?