You realize this was an injunction right? Not a legal ruling for the case? It will lose when it goes to courts, just like with Brady. (And every single other suspension that has been fought against)
I wouldn't be so quick to bunch up Zeke Elliot as another one of suspension cases. Brady lost after the NFL appealed because judges in NY saw that the evidence of tampering was compelling (deleted messages), but they did recognize the inconsistency with Roger Goodell's punishments. With Zeke in comparison, it's going to be very hard to ignore the salient problem that the NFL fucked up the investigation process by conveniently ignoring Kia Roberts' report. Never mind that the suspension itself has no real reason for existing: you can argue that Zeke deserved some games for the topless incident, but he was still never charged for domestic violence (which again, goes back to Kia Roberts's report showing that credibility of accusations was damaged because of the lack of consistency). The problem as a whole is suspending Zeke Elliot for a myriad of actions.
Even if people argue that CBA already covers non-convictions ("conduct detrimental to the NFL etc."), the problem is going to be in proving why and how Zeke Elliot's conduct not only harmed the NFL, but also justified the 6 game suspension. Given Goodell's already inconsistent precedence, he's making it hard for himself to make a solid case.