It matters what type of skin you have, there’s a genetic component. Most “Australians” are of Irish/British descent and not ready for that much sun even with a bit of a tan/priming. Indigenous Australians do not have high melanoma incidence.

Although skin color is an obvious visual indicator, two people with the same shade of skin can have very different responses to sunlight because there are non-tan-related genes which affect rapid DNA/tissue repair on your skin:

Clinical and Biological Characterization of Skin Pigmentation Diversity and Its Consequences on UV Impact https://pmc.ncbi.nlm.nih.gov/articles/PMC6163216/

So what I said is especially applicable to people who are not the palest on earth. If you are mixed like me (French and Iranian combo) then you can push it more than a say “pure” Irish person.

Thankfully the paler you are the less time in the sun you need to make vitamin D. But I will bet that some sun exposure is still better than none.