Average. If you’re going to argue conferences championships don’t count, then Oregon’s game against Penn State shouldn’t count which makes them a top 20 rushing defense.
Take out the conference championship games and games against Jeanty and UNLV and Oregon are suddenly top 15 in opponent yards per rush.
I’m not going to argue that didn’t Boise State didn’t have an easy schedule, they did. But Jeanty performed every week, even against the few good rush defenses. Also, all of those teams’ rushing stats are worse because they faced Jeanty.