Unfortunately that's not the case.
Anyone can actually purchase Euro plates, so it's not really that hard to do.
The car isn't actually driven by anyone directly associated with Volvo.
The prototype vehicles are driven by people who specialize in the field of prototype testing and it's their obligation not to leave the car in a place that can be seen for extended periods of time. Obviously something they neglected to do when the photo was taken.
Prior to releasing vehicles in Australia, overseas manufacturers go to great lengths to test them in harsh Australian conditions, so it's no surprise that it has been via Broken Hill.
Either way, I can confirm that it's _not_ a VE Commodore.