a DNS issue?
Not sure how someone hacking the site could change the DNS resolution of www.rugbyrefs.com. Though i see the nameservers for the domain are ns1.rugbyrefs.com and ns2.rugbyrefs.com which is on the same subnet as www.rugbyrefs.com (in fact ns1 and www are the same IP) so I presume thety are all hosted togeher. So some other kind of breach could have made them, vulnerable.
Or somebody at the hosting company stuffed up of course.
80% of security breaches are internal (allegedly).