Hubris in action- there is always someone cleverer than you!
Seriously though it would be interesting to see how this works legally.
The royal proclamation (which I witnessed being read out) said:
‘Prince Charles Philip Arthur George, is now, by the death of our late Sovereign of happy memory, become our only lawful and rightful liege lord, Charles III, by the grace of God, of the United Kingdom of Great Britain and Northern Ireland, and of his other realms and territories, King, head of the Commonwealth, defender of the faith’
England is a part of Great Britain (along with Scotland and Wales) so the King is King of England in the same way that Biden is President of Florida - its a legal fact but not a title
They should have gone full south park though and used his title King of Canada