There's a newer policy from March 2022:
"In accordance with New York State and Erie County guidelines, Highmark Stadium will no longer require proof of vaccination for entry into all events, concerts and live sporting events, including home games for the Buffalo Bills.
There's a newer policy from March 2022: "In accordance with New York State and Erie County guidelines, Highmark Stadium will no longer require proof of vaccination for entry into all events, concerts and live sporting events, including home games for the Buffalo Bills.
The new policy will go into effect immediately. "
https://www.buffalobills.com/news/highmark-stadium-lifts-all-vaccination-mandates-effective-immediately#:~:text=In%20accordance%20with%20New%20York,will%20go%20into%20effect%20immediately.