Media has to average out what teams actually do. Some stay under the cap, some go up to the cap, some are the Eagles.
Bills can spend whatever they want, as long as they have willing partners in FA or trades. Just depends what they are willing to spend on keeping their own or mixing in new talent.
One wrinkle we have to consider this season is cost overruns on the new stadium? What bearing does that have on team spending, if any?