Sorry to see the damage to your car Chris.
I had some hail damage to the Jaguar (aluminium body) a couple of years back. My insurance cover it at no cost to me and the repairs are totally invisible. Nothing as bad as yours though. Hopefully they will be able to put it right.
There is nothing new about severe hail storms in Sydney. If I recall correctly from some reading the first settlers in Sydney, shortly after arrival of the fleet, suffered a severe hail storm that injured several people and killed a sheep, and on May 14 1798 there was a severe hail storm with stones up to 6 inches in diameter. Poultry was killed and lambs knocked down (whatever that may mean). I have never been under a bad one, by sheer luck, but I have seen the aftermath of several. They tend to pass across the Sydney area in a relatively narrow band and when it happens not only do cars get damaged but windows, roof tiles, and anything else that is breakable.