It looked like the Bills took nothing from the way the Ravens D played the Bengals.
Unlike the Ravens, the Bills front 7 was not capable of stopping the run while the secondary sat in cover 2, which is pretty much every team's solution to keeping Burrow and Chase from connecting deep regularly.
Not to mention, their soft coverage was getting eaten up all game, and the final nail, they had no pass rush at all. Losing Von Miller obviously hurt in that regard, because they were previously getting pressure with only 4 at the highest rate in the league. But the snow certainly didn't help either.
And the Bills offense is basically, "Josh Allen, go do something." So when he has an off day, that's a problem. Bengals defense is pretty good anyway.
So with all of those factors, things really snowballed for them. Pun intended.