Under Pemberton, Rhea has never thrown very much because that just doesn’t fit his coaching philosophy. I believe they threw the ball more the years before Pemberton’s son was QB - when they had Dotson at QB and Noel Patterson at receiver.
As EagleVolSteeler stated they lined up in more of an old school “straight” T formation and ran 2 tight ends for a while. Zach Pemberton did carry the ball quiet a bit because they ran a lot of triple option out of that formation.
the last couple of years Pemberton did move to some I formation backfield sets because they featured the very talented Ethan Davis at running back, but Pemberton is primarily an old school double wing T guy.