I think the idea Beasley has somehow regressed is speculation without much fact.
Cole Beasley recently addressed this on Twitter. "You don't go from double coverage to ineffective in one off season "
I could see him playing for Buffalo in 2023 as well
He retired because the Bucks paid big bucks for WRs and they would not use him much. Those are his exact words.
https://www.espn.com/nfl/story/_/id/35243913/wr-cole-beasley-unretire-sign-bills-practice-squad
Beasley is the key to longer drives and more touchdowns. Diggs will be in single Coverage and Davis will be wide open. This is a huge addition in December.