Yes, I know blimps fly over sports events all the time and I never said they were banned.
What I said was "Airspace over NFL games isn't exactly free and open to any and all." As you admit, there are guidelines and a process for approval. That's the point I was making. You can't just rent-a-blimp and fly it over an NFL stadium without going through countless layers of bureaucracy - with both the league and the FAA. It isn't quite as simple of a process as when, for example, a group of fans hire out one of those planes with banner messages to fly over a team's training camp practice.