I don't know if they're blocking it at the DNS level, or if there is some way of blocking the actual site. But that's the IP address. Why couldn't someone use any generic proxy to visit Pirate Bay?
I just don't see how governments can actually block websites, without confiscating their servers and/or forcing ISPs to monitor and block any attempt to get back online. As long as they've got a server and internet access, it seems to me like the government has failed.