Frost as HC Team Run/Pass Percentages (win%):
2016 UCF: 54/46 (.462)
2017 UCF: 54/46 (1.000)
2018 UNL: 54/46 (.333)
2019 UNL: 63/37 (.416)
Two things:
1 - it's best not to look at "even" as being 50/50....nearly all teams run more than they pass, due to play-call outcomes based on late-game score. You pass a lot if you're behind with a chance to catch up, but you run a lot if you're ahead by a little or a lot, and if you're behind by a lot. Based on EXTENSIVE research on this, I set "even" at about 58/42. That's not scientific, just based on 1000+ team season ratios...it could easily be 56/44 or 60/40. But it's certainly not 50/50.
2 - a team's record does affect play-calling, as the more a team loses, the further from their ideal goal of run/pass ratio they tend to stray (towards pass). This makes the above pretty remarkable, that Frost's ratio remained the same through a losing season at UCF, an undefeated season at UCF, and a losing season at a new spot, Nebraska.
BUT, if you give any credence to my findings in #1 above, he's right in suggesting Frost has moved from being on the edge of balanced and pass-heavy (54/46) to the edge of balanced and run-heavy (63/37). But to suggest he's been anywhere near run-heavy before 2019 would be incorrect.