There have been all sorts of reports about where these rifles are made. What is the meaning of "made"? The Harley Davidson motorcycle is quintessentially American, and is assembled in the US primarily in Lancaster PA, but over 50% of the parts are outsourced, many offshore. Parker Hale Mauser actionned sporting rifles had a Spanish action assembled in an Italian stock but are considered English.
To be marked "Made in Australia" there are certain legal requirements under Australian law, but it is not necessary that each and every part is manufactured in its entirety in Australia. As far as I know, these rifles are not marked "Made in Australia".
Now this is just an opinion, but I suspect that many of the parts are outsourced, possibly offshore. This is a standard industrial practice in all industries. The source of the parts is essentially irrelevant, because the company marketing the product is responsible for them. I wouldn't be surprised if the rifles are not set up and finished in Brisbane.
Given Australia's export controls on firearms and their parts, obtaining spare parts directly from AIA is not really an option. The national distributor would be the only logical source. If you own one of these rifles, surely the distributor would inform you about what original AIA parts are available from inventory.
Most of the discussion of the origin of these rifles has resulted from the reluctance of the manufacturer to make any information available. Is the receiver machined from a casting or from a forging? Who is making the barrels? Does it matter? Should the consumer be allowed to know? Remington doesn't have a problem with people knowing that they are marketing a line of firearms with origins in Eastern Europe, or Browning with firearms marked "Made in Japan".