because you wouldn't know the password before the public announcement, and after the announcement it doesn't matter.

That's why for these types of archives the password actually contains the credentials.

true, but in this case the password contains "antis3c" [Antisec], the group that is responsible.

So download it, decrypt it, and pick a different password. Takes a couple minutes, tops. And if your 'release' gets more attention than the original, how does the original prove that's what happened, or even get heard?

You can see who came first, the internet knows.

The internet attributes much to the wrong sources. And forgets many redactions. I wouldn't trust such a thing to the internet.