I wish it was that good an answer.
I RTFA. It wasn't.
This was a hearing on a motion objecting to a procedural point. The previous proceeding, in front of a Federal magistrate (not a judge: key point, although obscure) at which the order to decrypt the drives was issued, was attended only by the prosecutors and the magistrate. Defense counsel was not present and was not able to argue against the order. According to TFA, the judge agreed with this part of the motion, set the order aside, and ordered both parties to submit additional briefs on the matter.
It isn't over.
At this point, as I read the tea leaves, even if he wins the 5th Amendment case, Feldman is toast. They found kiddie porn on the one piece they were able to crack. They also found financial data on the drive that ties it to Feldman. Even if the prosecutors are forced to go to trial with just what they have today, they almost certainly have enough to convict him for possession of kiddie porn and put him in prison.