Looking for some numbers to hang my hat on:
Since the beginning of of the 2022 season (over 1400 games), the team that had the higher passer rating in a game won 80% of the games (aside, pass and stop the pass being the key to winning in the NFL)
In 2023 The Bills have had five games where the other team had a higher passer rating. The Bills lost all five of these games.
In 2023 The Eagles have also had five games where the other team had a higher passer rating. The Eagles won four of these games.
One possible conclusion. The Eagles are very good at overcoming a weak passing/pass defense game. And the Bills are very bad at that. I reject this conclusion for game day.
Alternative conclusion. The Bills should really be 7-4 and have had poor luck, and the Eagles really should be 6-4, and the Eagles have just been super lucky. Further today will see the regression towards the mean of this luck factor, and the Bills will win the game in a blowout.