The article touched on, but blew right by, a key point: Western Europe united, accepted (a divided) Germany back into the old, and rebuilt. Asia did not. True - but this is not Europe. There was, and is, a European identity. Europe was "united yet separate" for centuries under the Roman Empire, the Holy Roman Empire, the Hapsburg. Royal Houses intermarried. Kaiser Wilhelm, King George V and Tsar Nicholas were cousins and all grandchildren of Queen Victoria. The was no analogous situation in Asia.

Comparisons of China to Rome miss yet another key point. Rome actually ruled much of Europe directly, ruled yet more indirectly, and had profound influence on still more lands outside the center. Chinese culture may have had a profound influence on surrounding countries, particularly those that directly bordered the Chinese Empire, but China did not rule over any of those lands. Chinese Imperial rule even within China proper weakened in direct proportion to distance from the Imperial Capital, a state of affairs that exists even today in the PRC.

China in "Asia" (a word which does not exist in any Asian language except as an import) was most definitely not the same as Rome in Europe, and that difference is crucial to understanding why Western Europe was able to pull itself together after WW2 (well, that and the existential threat of the Bear holding down Eastern Europe) when Asia went a different route. You cannot pull together a collection of States that have nothing in common other than geographic proximity.