Lou Reed stated it wasn't, he said it was far simpler, it really was genuinely about spending the day in the park with a beautiful girl drinking sangria then going home.
The key to this story is that they have banned the official 'choir' from singing it, something they arrange and put on ahead of each game. It is their decision to make.
There is no indication or implication that they have any intention of banning fans or anyone out of their control singing it...