Neither China, nor Japan, nor South Korea, nor Singapore were colonized by any western power. (Singapore, or for that matter, Hong Kong do not count, since they were tiny fishing villages before the British moved in.)
Furthermore, the colonial influence was restricted, in the case of the larger nations, largely to the control of trade (mostly, Opium).
The colonization of Northern India was fraught with centuries of oppressive rule, rebellion, civil war, an eventual overthrow, and then a massive schism and religious conflict. Millions died. India was the crown jewel of the British empire for much of it's history, and brought massive profits to, if not the empire that large, than certainly the merchants running the show.
China was decimated, first by the Taiping rebellion (in part instigated by Christian missionaries), then by the Opium trade, then by Japanese imperial ambitions (which, I may remind you, were completely non-existent until the USA force open the ports of Japan), then by the civil war, then by the Maoists and the ill-conceived and executed model of western modernization. China has been the manufacturing center of the world for decades now, benefiting, largely, so called first-world nations such as ours and as a result the population is suffering the consequences of a terribly polluted land.
The leadership of Japan lead it into world war 2, and millions of it's people died because of it. In the era immediately preceding the opening of Japan to trade, it was one of the most peaceful countries in the world, having no major external conflicts, and no major civil wars since the Sengoku period.
I don't see why your examples imply that jsnx is false. On the balance they seem to support the statement, and it wasn't claimed that all or even most of them would, simply many.