What they're really saying is that all websites will add a 'are you really over 16' checkbox?
Apparently the gov has been setting up their own system for that:
https://www.esafety.gov.au/newsroom/media-releases/statement...
Which will probably work as well as most apps implemented by the Australian Govt; myNDIS, myGov, myMedicare etc etc etc. They are all trash. We do not have a good track record in this area.