Easy... this isn't about space.
It's an excuse to pour money into hi-tech boondoggles in South Australia - i.e. a pork-barrelling exercise to win some votes in marginal seats.
For those unacquainted with South Australia, it is basically an arid desert state, very isolated from the eastern states, in dire need of anything to boost its economy, and also happens to be the home of Woomera (rocket range used by the Brits 60 years ago) and the Defence Science and Technology Organisation.
The Australian federal government has a history of large boondoggles in bizarre locations that frankly don't make any rational sense in order to prop up a state economy that would otherwise have failed long ago. Sheep farming in a desert (why, you might ask, as many perished in the attempt), Woomera (abandoned decades ago), car manufacturing (sense finally prevailed at the hands of accountants), a submarine base (on the wrong side of a very large continent)