Yep! I can never find them, but there were even World War style anti-australian propaganda posters depicting Australians as white supremacist monsters coming to take over NZ. I don't know who they were distributed by at the time and I can never get a Google search to turn anything up.

I think it was sufficiently disambiguated by the word 'dedicated', it wouldn't be possible to have Australia both dedicated to agriculture and to have a city the size of New Zealand inside it. But thank you for explaining.

I had the same thought (both my initial misreading, and the idea of making the joke).

I went to primary/secondary school in the United States. I feel like this joke is the sort of thing that an English teacher would say to me in response to me writing something like this (which I'm sure I did). I think part of the humor (for me, at least) is the refrain of that particular (and common) criticism :)