[leereeves]

All of those sources are discussing average outcomes across the entire population.

None discuss outcomes among only those who "have the means to afford it" so none of them refute GP's claim.

[bombcar]

Correct, where do the princes and sheiks of the Middle East head when they need the best medical care money can buy?

[kashunstva]

I’m not at all convinced they look carefully at health outcome and cost efficiency metrics before deciding where to point their private jets. Instead, I’ll bet (in part) they use high cost as a surrogate for quality. And the immediate availability of any test or consultation they desire.