I think some of these things might actually hold up in court due to the language likely found in the rule book and membership documents. Lines that state that ethical behavior, high standards, fair play, spirit of competition etc. are expected of each member should be in play. Basically, find anything that states being a scumbag for an advantage on the field is against the rules.
Everyone knows this was morally bankrupt. Using a legal technicality might work, but pointing to the well communicated standards of behavior likely required by members of the NCAA is within reason. When you have a contract with someone whether you deal in medicine, law, real estate, construction, accounting etc., you are supposed to use skill, care and diligence when providing a service. When a member of the NCAA shows anything but adherence to the spirit of the rules, there is reason to take a hard look and see if they willfully did something outside the implied standards set forth by being a member. Did UNC use skill care and diligence in this scandal? They did, except they used it to cheat.