But note that this article was about a Korean family travelling in the US.
A foreign family travelling in Australia won't be covered by Australian Medicare and will be at the mercy of the medical cover on their travel insurance, which is the real story here.
That's not to say that the charges for this visit weren't exorbitant, but your case isn't an apples with apples comparison.
That's not even paying 30 mins of the nurse. You are kidding yourself if you consider this is the total cost.
But it’s still easy to compare. Look up public medical expenditures per capita. The US’ ranks amongst the highest, while covering few people and quite poorly (the VA is... the VA).
By comparison, Australia spends about the same per capital and covers everybody, without everybody needing to fill out $1000/mo (like I do - for family of three)for insurance.