A few things:
1. Her being a liar won't matter (and it shouldn't) in court or to the NFL. Just because she's dishonest doesn't mean he didn't do it.
2. The bit about her being white, him being black... From what I've gathered, that's hearsay at this point, and isn't recorded on any media (text, email, etc...).
3. They aren't going to win an equal opportunity case by simply referring to a single case where a white guy got less time. All they'd have to do is create circumstances out of thin air to justify their decision.
Again, if he didn't do it, I hope his legal team is successful in going scorched earth on the league.