It's talking about the auto-generated root password that gets emailed to you upon creation of your VM initially. Most everyone would, hopefully, have changed his/her root password manually, upon receiving it in email via cleartext.
I'm getting conflicting reports about the passwords. Were these plaintext passwords ONLY the autogenerated ones, or are there other passwords that have been compromised as well. Also, has anyone been able to get a list of everything that was displayed on the page?