Are you cherry-picking stats?
Did their passing game improve...?
I have not cherry picked, I've simply gone year by year.
They're posted elsewhere by the way, last time I totaled it up, even if you include last year where the running QB heavily skewed things and put the numbers into the 40s, if you average it out, DeBoer's offenses rank in the 80s in terms of rushing. I was saying all this stuff when Alabama was still hot, I was saying this stuff last year as a matter of fact.
By the same token, once you remove QB scrambles, you end up, every single year (I said it would happen this year by the way if you want to dig it up, I pointed this all out prior to the season because it's just what his offense does) with ratios of using the running backs that fall in the 30s, so a little over a third of the time they hand off to the running backs. It's predictable, which is why I correctly predicted it. This year, last year, at Washington, etc...
So it's easily identifiable, all there in the numbers, like clockwork pretty much. But if you create a trend you can break it, but it will take some different coaches brought in to address that because it's not in the area of expertise of DeBoer's coaching core.
I will add by the way that some years the running games look better than others, but then when you poke at it you see things like leading rusher is a QB, or second leading rusher is a WR, so it's just never a typical strong running game (he's averaged in the 3s on three occasions I believe) and I literately haven't ever seen a DeBoer game where the running backs really carried the team. It's a change of pace, which rarely ends up in a balanced game.
To summarize, the DeBoer trends are:
Regression in the run game, I think year to year I noted improvement once.
Low averages, I don't think I recall ever see it in the 5s, three different stops in the 3s.
Low ranks, multiple ranks in the 100s, very low average.
Low usage rates of running backs, never in the 40s.
Unorthodox rushers, high use of wide receivers and quarterbacks, simulating a true running game.
Edit: To address what you are getting at, yes there were some positives and I made a big post addressing this. The passing game does improve generally speaking, offense does improve overall. But my point to that is he basically developed a strategy to win some games at a school with limited talent, to mask their weaknesses and he's applying that to a team that has all the talent they need, masking weaknesses he basically created by gutting the running game.