It's a good point. Everyone living in Australia knows what "NSW" means, and it's a website that's almost always only used by people living in the state. Except for a page on dark patterns :)

Same blindspot as Americans using two-letter codes for their states (AZ etc.), or any other country's inhabitants using locally-known place names, or not adding their country after it.

Haha, how curious.

Googling '"new south wales" site:www.nsw.gov.au', some pages have it apparently written out in full, but clicking through to the e.g. "State Flag" page, they've updated the page to say "NSW"!