Of course they have to uphold it. The question is why would an AD sign a $90 million 10y deal with Jimbo? Who else was threatening to offer him that kind of money?I mean if both sides didnt agree to the terms they shouldnt have signed it. Afterwards they have to uphold it.
Also, why the long term nature of the contract? Make the guy the highest paid coach in CFB at $12 million/y (if you believe in him) but do it with a 4y contract. After each year, extend a year with bonuses if things look good or buy him out for $36 million. Keep repeating until he fails.
With his current contract, if he flames out in 3y, he gets paid $30 million a year, if he does a great job and lasts 10y, he makes $9 million. Pretty ridiculous if you ask me.