If you read the article they are simply saying the Bills have received trade offers and are considering.
Basically, they didn't pick up his option, smart move, if he gets hurt they can cut ties and move on. If he's healthy and plays they can work on a long term deal or franchise tag him.
Some teams may think they are looking to move on from him so they are calling about his availability. Now if someone is willing to give up the farm for him, you have to consider it.
It's really nothing substantial to this article.