You're confusing nominal us dollars and adjusting for price and inflation, or what the OECD calls Purchasing Power Parity (PPP). This is what the article uses and is more meaningful than nominal gdp per capita.
Here's another source. Also uses the OECD's PPP.
You need to look at the article. That's not my problem.
Edit: You edited in
GDP per capita =! GDP per capita PPPafter I posted my reply. What in the living fuck is wrong with you!