Literally none of those seasons were on par with any prior seasons. Before 2021, Hoke had more 11 win seasons than Harbaugh at michigan. You had one season of double digit wins in the previous four, then won 12 out of nowhere.
Also, the OSU staffer that was quoted even made note that during the game, he looked over at Stallions reviewing his sheet of calls. If we changed our signals and Stallions didn't have anything, how could he have had any information to review? He said OSU "changed things up" but obviously Stallions still had everything (not to mention the continuous conversation about michigan having OSU practice film).