Did you read the article? Look up the word "waive"(versus "overturn") in the dictionary. College graduate or not, conferences have rules about transferring within the conference. As per the article:

"Although Carrington is on campus in Salt Lake City, he hasn’t officially joined the team. The faculty representatives at Oregon and Utah are still reviewing the matter and must waive the conference’s intra-conference transfer rule, which requires transfers within the Pac-12 to sit out a year of eligibility."

Vernon Adams played in a different conference / at a different level. His situation was not even remotely close to Carrington's just as Tyner going to Oregon State is a completely different situation.