Appears to be the DNS that's changed rather than the site as suck
Their DNS servers appear to have been changed. Looks like their domain registrar got hacked.
And you gotta love that the hackers have a copyright date on their hack page!!!
It's also a scary one as if you hack a registrar then presumably as well as changing the DNS servers you could also change / remove the DNSSEC key, defeating any security advantages that brings...