According to Horowitz's weblog:

"We are battling a dedicated and pernicious hacker based in Communist China, who is attempting to divert visitors to DiscoverTheNetworks to a Communist Chinese website. The hacker has been blocked from the site several times but keeps coming back. We will defeat him in the end, but need your patience in the meantime. In addition to showing how serious and unscrupulous our enemies are, this hacker demonstrates -- no doubt inadvertently -- our international reach and respect."

Let's hear it for the anonymous Chinese guy who shut them up.