More likely is that, given how quickly Rice's case was adjudicated back in May, the league really didn't see the video, because its main goal was to see the whole thing get swept under the rug before the start of preseason. It might have actually worked, except that this is America, and cameras are fucking everywhere, especially in the elevator cars of casinos and hotels. So a video was known to exist by definition, it was simply a matter of time before the world saw it.
So the upshot is that the league wasn't interested in seeing it, because that would have tweaked the official narrative of a good kid who had a bad night, and had never done anything like this before, and would never do it again, so let's let him off easy, and pretend this never happened.
If I were a betting man -- and when it comes to football, I am -- I would bet that Goodell is out of a job by the end of the regular season, probably announcing his resignation before Thanksgiving. A more fitting and contrite response might be to simply exchange the increasingly tedious October pinkwashing campaign for a genuine domestic violence awareness campaign. It's probably about as likely as Ray Rice ever playing in the NFL again, but it would be a step in the right direction.