They aren't proof, but they might be enough (I am not a lawyer) for a search warrant for email addresses, person's homes, and phone/ISP records of the people named in the "d0x."
A friend of mine a long time ago back in the 90s beat one of these things because they didn't have a warrant. Cops came to his parents place while he was out. Parent's let them in, they found a bunch of telco manuals, seized the computers, everything in the room was inadmissible because he was renting the room from his parents. He was a lucky guy. He also stopped bitching that his parents made him start paying rent.
They admit in the document to "backhacking" the targets, which already puts them at an advantage against law enforcement.
edit: s/probably/probable (it's late)
https://secure.wikimedia.org/wikipedia/en/wiki/Computer_and_...