Good question. I found the below online:
To work around this limitation for Coach Kiffin's contracts, Ole Miss used a structure that includes:
• A state contract, which is capped by the Mississippi law.
• A second, much larger contract with the Ole Miss Athletics Foundation (OMAF), which funds nearly all of his actual compensation.
• The OMAF contract has utilized provisions like automatic one-year extensions or rollover provisions (sometimes triggered by performance, such as achieving seven regular-season wins) to effectively extend the term beyond the four-year limit without violating the state's four-year cap on the official state employee contract.
This structure allows the university to offer long-term financial security while legally adhering to the four-year contract limit for state employees.