didn't suggest that, only that Fetter doing analysis of an incoming pitcher is not something new to this season.
But since you mentioned it, FWIW, McCoskey reported at the time that not only did Hinch already know Fetter, but Avila had him on a short list from before they hired Bosio. (LOL-so 'Avila' to take years longer to get to where he could have been earlier!)
https://www.detroitnews.com/story/sports/mlb/tigers/2020/11/06/michigans-chris-fetter-tigers-new-pitching-coach/6185959002/