Unsurprisingly, Babet either hasn't read, doesn't understand or is lying about the legislation. The law doesn't ban kids from watching Youtube, just self publishing on Youtube on a personal account (or commenting etc that requires a personal account). Youtube doesn't require an account to watch content.
That's not true either. None of the laws are in effect yet, but age verification will certainly come into effect for Pornhub come December, as it has in the US states with local age verification laws.
Not that I expect any of this legislation to be effective with even moderately technically competent kids, and there's zero chance of Australia implementing a China style "Great Firewall of Australia" without reversing course on the last 30+ years of privatisation (are they going to jam Starlink like Russia in Ukraine?).