I think every coach will get asked this question now. Walter's answer...
Purdue altered its signals before the game, and apparently that wasn’t a big deal. “I thought they handled it well,” Walters said. “There wasn’t any issues in terms of communication breakdowns.”
Purdue quarterback Hudson Card echoed his coach and noted it is “pretty common” to change signals regularly. “It happens regardless of the situation,” he said.
https://www.mlive.com/wolverines/2023/11/purdue-coach-on-his-michigan-sign-stealing-comments-i-called-a-spade-a-spade.html
Purdue altered its signals before the game, and apparently that wasn’t a big deal. “I thought they handled it well,” Walters said. “There wasn’t any issues in terms of communication breakdowns.”
Purdue quarterback Hudson Card echoed his coach and noted it is “pretty common” to change signals regularly. “It happens regardless of the situation,” he said.
https://www.mlive.com/wolverines/2023/11/purdue-coach-on-his-michigan-sign-stealing-comments-i-called-a-spade-a-spade.html