As I said above, I don't think this necessarily means she won't rule until August 30, just that she wants to have her clerks dig into it more before she rules.
Even without a ruling, today was a huge victory for Vilma. There's now a federal court that has commented on Goodell's process as unfair and harshly criticized both the process and the result. The media loves a sensational story, and that certainly gives them something to write about. If the result (for now) is that the courts recognize Vilma is getting screwed but that they have to wait 3 weeks to give him relief, imagine what that will do to public opinion.
Also, there is HUGE pressure on the NFL now to settle, and on the Appeals Panel to seriously question whether it wants to just blindly uphold the suspension. If the NFL lets this get back to the Judge after August 30 (assuming no ruling before then), they know to almost a certainty that there will be precedent handed down condemning the CBA's process and remarking on Goodell's evident partiality/bias. The NFL wants (needs!) to avoid that.