looking at 2019 - the year before covid blew everything out of the water and it's unclear how care has been apportioned, other western European countries spending more as a portion of GDP
Germany, Switzerland, France, Sweden, Belgium, Norway, Austria, Netherlands, Denmark all spend more (as well as the US, Canada, Japan, Austrailia)
Eastern and Southern European countries have very different demographics, income levels, and from personal experience expectations -- certainly Greek healthcare is very different to what you get in countries like France, UK and US.
Do you have a non-youtube source? The only place I found which said UK had a better healthcare was "investopedia"… and their criteria didn't seem to have anything to do with the health of the patients.
"The healthcare system of New Zealand has undergone significant changes throughout the past several decades. From an essentially fully public system based on the Social Security Act 1938, reforms have introduced market and health insurance elements primarily since the 1980s, creating a mixed public-private system for delivering healthcare."
I don't see what this has to do here, since the other comment was comparing to Portugal, Spain, France and the likes.
In any case, usually when you start making it private it gets better for a little while, to convince people to move over, and the government to defund the public one.
Then when the competition from the state is over they can start reaping the profits (like in USA).