from the linked Wiki page, clearly the Nordic countries have no interest in becoming Communists...so Lenin's statement is not true. Had you done more research you would have know this and not damaged what credibility you have.
And, to beat a dead horse, Mamdani is not a Communist...just a Democratic Socialist looking out for those who aren't billionaires. Not sure why you want to fight him on this. Got any answers?
Link: https://en.wikipedia.org/wiki/Popular_socialism_(Nordic_countries)