It isn't so much a press release as a 'zine. And that group (and others) have done several others (the best known one being 'zf05.txt' - zero for 0wnage) where they compromise a bunch of well known security sites, rummage through all the files/passwords/etc, then delete everything and post the full log publicly.
How they got in doesn't really matters - the point is, when I read those it gets me worried and makes me want to update everything and hide under a rock.