I was not a big fan of Langsdorf's offense, not because of his preference to "use the pass to set up the run", but because of his preference on a pro-style, non-mobile QB. When Armstrong graduated, and Langsdorf handed the QB job to Tanner Lee, there were many comments of "the run game will be fine, because the pass will set up the run". It's not as simple as that statement, because the run game needs to be schemed effectively, and the run game is easier when it utilizes a mobile QB. I understand that Wisconsin has an effective run game without utilizing the QB run game, but they consistently have one of the best o-lines in the country, and they physically outman most teams. Also, Wisconsin's tends to struggle with teams who can match up with them physically.
Now, I don't know if I would say that Frost utilizes the pass to set up the run. If anything, Frost has used the QB run game early to set up the rest of his offense. Yes, Frost does pass a good percentage of the plays, because he wants to be able to beat teams with the run and the pass. However, I do think that a physical run game (albeit out of the spread) is a staple of the offense.