No, he's talking about the ability to install an IP block for packets coming into NZ, not in other countries - in the past, as I understand it this has largly been used to black hole child porn sites
I'm talking about NZ's history of censorship, the tools that they already have for Internet censorship, and why the NZ government considered it important.
The IP block is a tool. It is also able to intercept HTTP traffic for sub-domain blocks, but everything is https now, so that doesn't work.
That leaves IP blocking, which I'm pretty sure NZ would have done if Facebook had refused to block content deemed illegal to import into NZ.
NZ has blocked the importation of books and video going back to 1880 (according to Wikipedia)[1].
New Zealanders continue to decide to keep the Classification Office - none of the political parties consider it an "issue". It works for the kiwis.
It was several years ago, but as I recall, Some (not all) NZ ISPs installed the filtering system, which let most IPs through, but redirected some to web proxies which were configured to filter banned content.