Just heard an interview with the Cincy radio announcer and he brought up a couple good points.
A professional cameraman wouldn't record through a window for something to used in a program. The video would have glare and other quality issues from being recorded from there.
The cameraman setup his camera on a tripod and aimed it at the Cincy sideline and left it there until challenged by security. It was never moved the the alleged subject of his story, the Patriots' scout.
The Cincy staff is all new so the Patriots do not have any previous video on the current staff. And they're not only looking to steal signals but also looking for body language tells, reading lips, etc.
The Cincy announcer asked Belichick about his previous statement that this crew is not part of the football operation but part of Kraft entertainment. When it was pointed out that the scout is definitely part of the football operation, he asked Belichick if as the head coach he was not aware that a member of his staff is being followed and recorded for a story, Belichick paused and replied "Nope". Hard to believe someone in Kraft entertainment would follow and record a member of Belichick's staff without checking first.