That is correct if you overlook the fact that the NFL is a privately owned corporation operating with an anti-trust exemption granted by congrees and they have potentially perpetrated a fraud on the public using the public airways while executing that fraud in a $750M facility that was in large part paid for using tax dollars.
One of the NFL’s teams may have cheated (i.e. violated the rules of the GAME they play).
It is an extreme leap from there to “...NFL...may have perpetrated fraud.”
Again, please cite the section of the CFR which the NFL violated.
PS - If some localities are foolish enough to use their precious tax money to build stadiums for GAMES, and if said loaclities’ citizens are willing to be subjected to it, that is their (local) problem. It STILL does not rise to the level of federal scrutiny.