I had the last one for a bit, and deleted it just now because I'm seriously doubtful these things are anything more then /dev/urandom piped into a file.
His point is based more on softer considerations like "they never used the previous insurance file yet, have they?" and "Wikileaks pulls a lot of stunts" and "this is just the sort of thing that would appeal to a cryptogeek like Assange whose avowed purpose is to throw sand into the gears of secretive organizations" and "so how did they get 300GB+ of leaked stuff since the site has been half-inactive for years and Assange completely distracted by his legal issues? Who would trust them with it? eg. Snowden didn't go to Wikileaks".