[Archelaos]

The numbers the article quotes are not the current US dollar GDP, but PPP (i.e. GDP adjusted to local prices) per capita. The 2021 current US dollar GDP numbers are rather far appart:

  UK         $47,334.36 
  Poland     $17,840.92
  Romania    $14,861.91 
  Hungary    $18,772.67

Source:

https://www.theglobaleconomy.com/rankings/GDP_per_capita_cur...

https://www.theglobaleconomy.com/rankings/GDP_per_capita_PPP...

[refurb]

PPP isnt static either. Youd expect as a country becomes more developed the purchasing power gets less as less as coet of living goes up.