It might not even violate the NFL's copyright if extracted from tapes. For one thing, something is only a "derived work" for copyright purposes if it's a "creative work" subject to copyright at all, and in the U.S., data sets comprising factual information aren't typically considered "creative". For another, it's not clear whether data about a recording is derived from the recording for copyright purposes. For example, a re-edit or mash-up of a film is clearly a derived work, but is a count of how many minutes each character speaks a derived work? Or is a Spotify-style algorithmic analysis of a song's musical style a derived work of the song?

I wouldn't want to put a large bet on where exactly those lines are drawn, though.