There's a lot of info here
Nicotine Vapes In Australia | Australian Vaping Supplies
I'm not sure how accurate and up to date it is although I did have a look around online stores in Australia and seems like you can still buy gear, and you can definitely buy wire, cotton, vg/pg, and suitable flavourings as well as get a prescription from a gp. There's some info in the link about ways to do that.
I'm not sure if the legislators thought this through properly because it seems to me at least that it's going to be impossible for them to enforce it without being a massive pain in the .... for potentially hundreds of thousands of Australians who are only looking for some pg based strawberry flavouring for their milkshakes and cake decorations.
It's brutal following your link to see "Out of the ashes, into the clouds" and "Australian Vaping Supplies is permanently closed." :'( So many businesses, up in smoke. So many jobs destroyed. And so many Australians left wondering what we're supposed to do.
I'm a full-time carer for the father of my children, whose lungs were wrecked by smoking decades ago. He quit with the help of vapes in 2011 but the damage was done. He's on an oxygen machine 24/7 now and so neither of us get out anymore. All of this caught me off-guard badly.
I've contacted a number of pharmacies, including a few new online-only establishments that appear extremely shady and tenuous. There is no way the carer's pension can cover the prices I saw. Even with those prices, stock unflavoured nicotine liquid was entirely missing. I was able to try a VEEV device (sponsored by Phillip Morris) and found it to be similar in function to the cig-alike products that were around in 2011. The price was the only thing giving me a throat hit, meaning I wouldn't purchase it even if I could afford it.
Then there's the issue of devices. I bought what coils I could afford on ZipPay in the 3 days prior to the vape-pocalypse. The one thing I really needed was a Lost Vape Ursa Ultra Boost UB Pro RBA. I found one but I was unable to purchase it.
And, insult to injury, I just received an email from Flavourworld Australia. They're closing, too. I used to use their flavours for food, too!