What he says is irrelevant. Look at what the new PM (Truss) is doing! Appointed a pro-fossil fuel energy minister (Moog) who says he will up output of the North Sea fields and will open up the UK for fracking. Whatever Charles III says about it will be at best (for the House of Windsor) ignored or at worse be damaging to him (and the continuance of the House of Windsor).
When I was working in Oz, my Ozite colleagues (I loved getting a rise out of them by calling them Ozites!) said after Elizabeth, Oz (Australia) would go republic. Let’s see if that happens!
With the Leftist party in power in Australia now that is more possible.
That would be wonderful, but it is very unlikely.