They were actually already under investigation before all the Tunsil stuff at the draft. They found that their old assistant coach (saunders or something) was fixing ACT scores for some high level recruits. They also got busted for housing recruits and their families on visits and providing monetary benefits to a number of recruits in some amount (less than $20,000 total). This was investigated by the NCAA and Ole miss was scheduled to provide their responses May 27. They were required to be forthcoming about all of the possible violations. These (above) were the findings and they put themselves on probation and volunteered to remove 3 scholarships each year for 3 years. The reason Turnsil is a BIG deal is because all of this was discovered before the Tunsil admission and text screenshots. They were caught not being forthcoming with the investigation because nothing about Tunsil was included. Maybe they don't have enough evidence on the Tunsil situation but if it's determined Ole Miss knew about the payments to Tunsil's family and withheld that from the NCAA investigation they could be seriously dinged.
To me the biggest deal is the faulty ACT scores to get recruits eligible.
I don't have any specific link and some details might not be exactly correct but that is the gist of it. If you look it up on google I'm sure you can find news on it. Also seems convenient all this Ole Miss news is coming out the same day Baylor fires Art Briles