The Post-Gazette is not the official stenographic service for the Steelers - you can go to Steelers.com to read what is subject to the editorial control of the Steelers
Is your position the Steelers should be able to tell local media who can or cannot cover the team when any piece is not fanboy coverage or a strict recitation of what happened on the field?
Someone in the organization is not happy with Bell (this latest story - Bell's agent saying he would take the deal last summer) and wants to send a shot at Bell. It is not Bouchette's job to self-censor information he and his editors think to be accurate. If the Steelers want to claim what Bouchette or anyone else reports is not true they have the megaphone to get their story out
FWIW ESPN confirmed Bell was late to the walk through last Saturday
http://www.espn.com/video/clip?id=22155347