They are planning to enforce access to these sites with the same mechanism.

https://www.esafety.gov.au/about-us/consultation-cooperation...

But it's the internet; for every one site that implements this, there will be a thousand that don't, and for every one that the government takes down, another thousand will pop up. And that's just the actual porn sites, there's millions of other ways to get access, be it websites, privacy-conscious apps, file sharing, etc. If people want porn they'll find it.

Of course, it being more difficult, technically involved, or otherwise shady will probably reinforce a message that it's not normal, because another issue is the normalization of porn to the point where people watch it in public. I'm also very aware I am just echoing the same thing an older generation has said about things like raunchy video clips on MTV, magazines like Playboy, movies with Marilyn Monroe, and painters painting a hint of ankle.