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The pseudo-Marxist imagery is just a wrapping. Politically, North Korea is a semi-industrialised feudal monarchy. Just as the USSR was an industrialised nationalistic proto-monarchy controlled by an emperor.
If you want millions of deaths, promote nationalism and imperialism. They always deliver.
Because it's wishful thinking. Frantic anti-nationalism in both words and actions was a cornerstone of life in the USSR, from Stalin's deportation of millions of "unreliable nationalities" to Brezhnev-era "friendship of peoples".
A "new Soviet man" (superhuman) was expected to emerge from that, with no nationality, no religion, no traditions, completely selfless, loyal only to the communist party, and devoted to work. This is as far from nationalism as one can get in practical terms.
This was not only ideological matter, but nationalism presented a fundamental threat to the Soviet Union, it enabled people in the USSR to self-organize and eventually break free. Nationalist movements that rallied people for self-government and democratic freedoms were a key factor in the collapse of the USSR.
It’s what communism is like in practice. You can’t say ‘that’s not true communism’ when that’s how every communist state ends up.
Do you have some counter examples?