The difference is that it's a shift in perspective. It's acceptable to say that white people aren't suited to live in Australia. It's not acceptable to say that black people aren't suited to live in the UK, for example.
It's unclear why an Australian site would be going into the question of who is "suited to" live in the UK.
The indigenous population of Australia is dark-skinned and has access to all the sun it needs in order to stay Vitamin-D sufficient.
Coincidentally, the COVID-19 mortality rates in Australia are low as well, though some might prefer to chalk that up to the strict lockdowns.