Depends on what’s meant by purer. As I understand it (thanks to the Far Outliers blog), North Korean is characterized by scads of Sinicisms. To the extent that using Chinese loan words/character combos (as opposed to Western loan words) is pure, North Korean is purer.
do you have a link for this?
Well, the point of that posting is not to define what is meant by pure, but the nostalgic way in which South Koreans look at North Korea as if it’s untainted (for that, I’d think those in Yanbian would be a better example).
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That was my take on it ,, unpolluted by western words for things they can only dream about in the north.
Of course North Koreans probably have 20 ways to say "eating dirt and bugs" that the South Koreans don't have.