Here is a link to the article (from June of 2022) where Fitz said he doesn't want to be a backup here and why. Good read.
https://www.syracuse.com/buffalo-bills/2022/06/ryan-fitzpatrick-reveals-why-he-wouldnt-be-backup-to-buffalo-bills-josh-allen.html#:~:text=Why%3F,that pattern continue in 2022.
Last season Fitz said he didn't want to be backup in Buffalo because everywhere he went to be a backup, there was some circumstance that led to him to start for most of the season. He said he wants to see Josh Allen play so its better if he stays away.
October 9, 2022 Bills 38, Steelers 3. I'm sure Tomlin didn't have to "remind" his team of that embarrassment. It was a meaningless preseason game for the Bills but probably had a bit more meaning to the Steelers.