PPP GDP is nearly worthless as a measure. It's a fraudulent number cooked up subjectively at a distance with very little on the ground information. Nobody actually goes country to country and surveys the details to calculate the PPP figures, it's created half out of thin air.
That's how you get Saudi Arabia at $55k PPP GDP per capita, ranking above Sweden, Germany, Australia, Denmark, Netherlands, Canada, Austria, Belgium, Finland, France, UK - you know, just most of the nicest countries on earth.
Back in reality, their GDP per capita is actually $21,000 and ranks them near Greece and below Portugal.
It's also how you get Puerto Rico ranking above Czech, Portugal, Estonia, Israel and nearly outranking Italy, New Zealand, South Korea and Spain. What a joke. Nobody actually went top to bottom through Puerto Rico's situation on the ground before calculating that.
Half of Russia lives very nearly in third world poverty, with incomes bordering on third world levels. By PPP GDP per capita they get ranked next to Portugal instead, which says absolutely nothing about the actual conditions on the ground for the bottom 1/3 or 1/2 of Russia.
Iraq gets ranked above China, Brazil and Colombia per capita PPP GDP. And just below Mexico and Argentina. Again, a joke.
You get Equatorial Guinea ranking on PPP per capita above Slovenia, Slovakia, Estonia and Portugal; just a bit below New Zealand, Spain and Italy. In reality it's a country with a GDP per capita of just $14,000 and a third world life expectancy of ~58 years. Another farcical PPP adjustment invented out of thin air with zero considerations for reality on the ground.