Great coverage in The Australian - referred to the crowds yelling out "We Love Max"!
So, what you're saying is that despite the long lecture on Australian history curriculum, people DO actually know who these two are.
Give me the Dutch King and Queen over those boring and (despite what is claimed here) unimportant Brits any day. I'm glad they're being received warmly.
Some people obviously know who they are. There are a lot of school kids there - probably bussed in and having had a few lessons on who they are the lead up to the excursion. If I was taking kids to see someone then I would do that and the crowds are largely kids - that I have seen - and it is a school day in WA.
Having some people know who they are doesn't mean that the majority do.
Sorry you didn't appreciate the outline of the Aussie curriculum but I was trying to show why many Aussies wouldn't have any interest or knowledge about The Netherlands - either as a country or its monarchy.