"You've probably heard the warning about how "descriptions" and "accounts" of the game are prohibited without the NFL's consent."
This is a misreading of the statement. What it actually says is that use of THESE descriptions and accounts is prohibited. In other words, you can't quote their words or use their images without consent. They NFL is claiming copyright on the contents of the broadcast, which is perfectly within its rights. Exceptions would exist for journalistic use, but I'm sure that all the major newspapers and broadcasters have obtained consent in any case.
Independently talking about the game without using their words is perfectly legal. Lots of people do it. Using images that didn't come from the NFL would also be legal if there were some good way to obtain them in the first place, but because the league restricts the use of recording devices at the stadium (within their rights because it is private property) those third party game images do not exist.
You do have to be careful how you use the words "Super Bowl" because of trademark law. Using the term to talk about the game itself is fine, but using it in connection with your own non-NFL-sponsored event or promotion is not. You can't have a Super Bowl public party or a Super Bowl sale, which is why you hear so much talk of the Big Game.