Good lord, what a bunch of malarkey. Did Diaco violate NCAA rules ? If not, then the two situations are different. Did Calhoun have specific "zero tolerance" language in his contract about NCAA violations ? If not, then the two situations are different.
I mean, seriously, this is just idiotic, frankly. UConn didn't have anything by which to fire Diaco FOR CAUSE. That's the difference. Oh, and he's white. Irrelevant.
Calhoun was a hall of fame coach with 50 years of coaching success and three (and a half) national championships. No, they were not going to fire THAT GUY for NCAA violations that, regardless of the narrative of how severe they were, were under his purview, but not actually committed BY Calhoun himself. The violations under Ollie were, in some cases, committed BY Kevin Ollie himself, and then he turned around and lied to the NCAA about it.
Knowing that there are known distinctions between cases precludes claiming, speciously, that the difference must be race. You know it, I know it, everyone knows it.
Pretending it isn't is intellectually dishonest, and that's being generous.