Ole Miss, and by extenstion Kiffin's offense, is definitely a "scheme school". Do they use RPO? Yes, but the offense is a mix of a LOT of different concepts taken from his years working with different coaches. He has worked with Norm Chow (West Coast guru), Kendal Briles (Baylor's "veer and shoot"), Jeff Lebby (UCF with Heupal's Air Raid/Baylor's offense), among others. He's gone from being a West Coast offense guy from his days at the Raiders and USC, to someone who has installed high impact schemes to fit the talent around him. This year his offense is actually running the ball more, but can be devastating in the air when needed. Now you add talent + scheme, and you get a high powered offense. Alabama, for all of their recruiting prowess, has also become a scheme + talent school. Add to that, he's installed a uptempo no huddle aspect to all of his offenses.
Play fast, score points, win ball games.
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Kiffin is one of the few coaches you could put at any school and he would have a good offensive unit because he has a breadth of knowledge of signature offenses, but he's not married to any of them because he takes into consideration the talent he has at his disposal. Saban said it best, Kiffin is one of the best offensive minds in the country. IMO, that's the very definition of a "scheme" coach.