I'm guessing you didn't read the entire article either. Pretty sure he did get some comments from current players and assistants. Just because he doesn't have credentials for the Bills doesn't mean he can't talk to anyone. It just means he won't have access to the PC's really. Not everything paints him in a bad light either. Sure, the article is written in a way to say McD is not a superbowl winning coach, but not everything is bad in it and not every player comment is bad either. Also, while everyone is focused on this 9/11 thing in the article... it was a very small part of the article.
What I don't like about the article personally is it could have waited at least until the season was over. This team is fighting for a playoff spot and still has ambitions of winning. It doesn't need further distractions. Of course, media people never care about how what they write affects peoples lives. All they care about is their story. That goes for most journalists, not just Dunne.