Do you have link to their previous hack?
http://www.heise.de/security/meldung/Web-Hoster-Hetzner-geha...
http://www.heise.de/ix/meldung/Datenleck-bei-Hetzner-1356468...
http://www.heise.de/security/meldung/Passwortklau-bei-Hetzne...
There was unauthorized access to customer data, even passwords. Someone claims to have accessed it via an FTP-server where he found a root password to a management server