This Q&A is hilarious. The CEO is just giving the same PR-approved answer to a politically sensitive question. The real and politically-incorrect reason for the higher prices is that the cost of doing business is higher in Australia. For example, the minimum wage is very high and consumer protection laws require the company to provide a 2-year warranty at no additional cost. It sounds like some people want to have their cake and eat it too. They want Australia's high minimum wage and strong consumer protection laws, but they don't want to pay for it. There's no free lunch in this world.
As for the demand side of things, Australians must be sufficiently willing to pay the higher price.
The Australian dollar has gotten weaker since this video was taken, so now Adobe's prices are almost at parity with the US. I'm sure the risk of foreign exchange fluctuations is part of Adobe's pricing strategy.