His biggest problem was it was a second offense and he lied about it.
Nobody remembers he told Don Fischer that the team was doing very well academically. We found out later that many were failing.
Most schools would today drag their feet even if the coach was a big liar like Sampson. The schools know today the NCAA will get bored and nothing will happen.
If it was only phone calls, Sampson could have survived. I'm not sure how he would have explained or fixed the academic issues. The NCAA gave him a 5 year show cause for a reason.