The whole article is thick with sarcasm? The only other bit of sarcasm/joke in the last nine paragraphs is that the author booed/jeered barnaby when he came to the stage. If "the whole article is thick" with sarcasm why is the last 37% so straight forward and not funny?
It comes directly after the line 'Barnaby is from New Zealand and I'm from Australia, and trans-Tasman friendships are regarded as treasonous', which FYI is also a joke.