The article is incorrect in its description of South Korean children increasingly having their tongues snipped in order to pronounce English words better.
That procedure was only done rarely, as far as I can tell from about 2002 to 2004. Immediately attracting heavy news attention there was even a government-sponsored video to scare people away from the procedure, which is virtually non-existent today. Fret not, there are still plenty of other opportunities for plastic surgeons in South Korea...
One thing to notice, however, is that Korean people would even consider that their tongues aren't naturally suited for speaking English, that's to say that their tongues could be different from other tongues. The idea of minjok (민족, 民族), meaning ethnicity or race -- the word itself a loan from fascist Japan during the Japanese Empire when Korea was annexed, though most Koreans are unaware of this --, is so strong in South Korea that indeed it might not seem strange for Koreans to believe foreign pronunciation naturally unsuited to Korean tongues. Similarly I recently saw Korean packaging that portrayed Korean digestive tracts as longer and more complex than those of "foreigners". In the South this "race"-based consciousness is fading away, in part surely because of English, the language that allows South Koreans to connect to the world. In North Korea it is far far stronger. There, along with the cult of the leader, the minjok really is the national religion, adapted from fascist Japan, which itself learned it from the German military (which trained the Japanese Army, which occupied and ruled Korea) and more generally the racist West of the 19th and early 20th centuries. Not that they didn't have their own home-grown prejudices in the region. Far from it, sadly.
Edit: All this said, it's both hopeful and ironic that even in North Korea the kids study English.