I managed to access the site using the network probes within Telecom that can make requests from a number of sites across the country. No issues for me.
sbiddle: They've presumbly blocked access from NZ - only the website host themselves could really answer this for you.
I can access the site through TelstraClear.
I've just had a similar problem and the site firewall was blocking me. It sounds like the same for you. When I did a trace route it would always time out in the US one jump before the site host.
The site I couldn't access has a lot of anti-spam protection because 99% of comments and new registered users are spammers and trolls.
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