Also the article was discussing "greatest economy ever for the USA".
Portuguese industrialization only began in the post-war period, Spain was still rebuilding from the destructive civil war in the 1930s, Türkiye was rebuilding from it's civil war in the 1920s, and South America largely had extraction economies that industrialized thanks to mass immigration from Europe throughout the 20th century
Post WW2, the only standing untouched industrial countries were the US, Canada, and Australia. And those 3 countries led developmental indicators until the early 2000s when Western Europe finally caught up.
Also, British India had de facto autonomy during WW2.
WW2 did help India industrialize, but British India was starting from such a relatively low base that it was basically playing catch up.
I'd recommend reading India's War by Srinath Raghavan to get an economic history of India during the interwar and WW2 period.
I don’t know about other South American countries.
I wouldn’t call Portugal an European power, they never had a significant population. Same for Switzerland.
Spain was completely destroyed just before world war 2 during a civil war
Most of Asia and Africa had been put under European control before world war 2, which actually was one of the reasons there was war: Germans had almost no colonies and wanted to expand
Turkey had lost world war 1 a few years back (Ottoman Empire)
The socialist world wasn't necessarily stuck in place either: Yugoslavia's high point, the years of the vikendica and middle-class leisure travel across Europe and Asia, was the 1960s-1970s. Granted, Yugoslavia was outside the Iron Curtain, but even the USSR is instructive here: living standards were rising even there during the Krushchev era, which is why the Brezhnev era is regarded as such stagnation.