Even if he DID call the cops, against her wishes, they couldn't have done anything about it. Reporting a crime against a third party, free of corroborating evidence - of which there was none - is not actionable as it's investigative-hearsay. It's not like seeing a crime on the news and saying 'I know that guy, I'm going to call in a tip,' that's offering third-party information to aid in an investigation. Here, there wasn't an investigation, as there was no report of a crime.
Kizsla is salivating over every purported act of impropriety around CU. Could you imagine his mock outrage had CU taken against Tumpkin, based on the available information: "CU's racist policies call for black coach to be fired based on unsubstantiated reports!" Or, "CU deprives black coach of due-process!" The slander/libel lawsuits that Tumpkin would have (regardless of his actual involvement) had would dwarf the current allegations - and Kizsla would have been drooling the whole time. He's a pathetic individual