"GDP measured in constant 2021 international dollars, adjusted for purchasing power parity (PPP) to account for differences in the cost of goods and services across countries"

Meh, idk what magic maths they pull, but any other sources I find do not corroborate their graph.

https://www.researchgate.net/publication/352708343/figure/fi...

https://dimiter.eu/Visualizations_files/cee/gdppc_country.pn...