Perhaps this may seem like semantics to someone who doesn’t live here but I find this sentiment at best ignorant and at worst offensive.
However, I think there is nothing further to be gained here as we would be arguing semantics.
It's common for "Australia's history" to refer to pre-colonisation in addition to the last couple of hundred years.
This is almost certainly because Australians see the country and the continent as 'the same' for all intents and purposes.