Lee Yoon-seop advocated for unification in his piece that was published in the North’s state media in 2016, South Korean media report.

He wrote that if the two Koreas were united under Pyongyang’s socialist system, people would get free housing, healthcare and education.

You omitted the key point here, the poem advocates for all of Korea to be united under the North Korean regime.

Personally I don’t agree with the charge but I can understand South Korea for not allowing glorification of the north. Anyone that thinks North Koreans have access to universal healthcare and quality eduction are lying to themselves.