IMO...
He kept what they've mostly been doing for continuity...plus...it's the style that Rhule has said he wants to hang their hat on and how "Nebraska needs/should play" in order to win. Which I've said over and over, it's dumb and grinds the fuck out of my gears.
If Grok is correct, then he's literally had one QB that has rushed for over 500 yards in a season with that being the Houston kid in 2019. If we see "old" Holgs, then I'd expect to see more traditional Air Raid concepts more frequently than we've seen the last two years. They've ran mesh, and ran it quite a bit actually.
I'm hopeful it becomes more concept based, and not specific passes designed to get dudes the ball. They've run a lot screens, TE leak, and shallow screens to get guys the ball in absence of a real passing game outside of mesh and curl/flat. Mostly IMO, because they couldn't protect well enough to run more 4 verts and Y-Cross.
I hope they incorporate more read game with the QB, and not the RPO world, but true Q read game, and inverted veer game....but I'm not holding my breath on that.