As I understand it, the government is not trying to reverse this ruling with the Assange case. The government posits that Assange helped in the acquisition of the documents, which is separate from their dissemination, IIRC.
Assange faces 18 charges, one of them has anything to do with his allegedly helping acquire documents. The others are violations of the Espionage Act for receiving and publishing documents. So until they drop all other charges, any "acquisition" he may have done is secondary to their attempt to outlaw publishing.