What part of the UK hasn't left the EU?Whatever is called Brexit is not what was voted for in the 2016 referendum.
He has not ‘delivered’ (why does that word piss me off in this context, or most contexts?) ‘leave’ which is what was voted for, for the whole of the UK.
Boris Johnson has not delivered on the referendum vote, and he has left the country with what was called a ‘democratic deficit’.