Players get cut in the NFL all the time. The new Bills regime gave him a shot, it was clear as day TE wasnt going to produce and he was not part of their future, and the organization quickly cut bait with him. No muss, no screwing around. He had no future in Buffalo....so he was quickly cut, as is the team's right.
Im not sure what your beef is. if anything, IMO it shows decisiveness and quick moving on the part of the front office.