Procedural arguments like this are silly. You have to judge things by what they are substantively. Feudalism and slavery were not utopian projects but they were clearly brutal. Nordic social democracy consciously set out to create a decent society for all and largely succeeded. I don't know what game the author is playing.
Nordic social democracy isn’t a utopian idea, though. It’s a progressive idea and an ambitious idea but it only really peeks out slightly from the normal range of market economies with welfare states, especially within Europe. Feudalism and slavery were awful, but don’t come close to the concentrated human misery inflicted by the utopian projects of the 20th century.
By that I assume you're largely referring to the Soviet Union and China during the cultural revolution? Yeah sure, those were bad, but it's hard for me to say whether they were particularly better or worse than slavery (at least from the perspective of a slave).
Moreover, I think that the assumption that those 20th century projects failed because they were utopian is unsourced. I think I could equally validly claim that they failed because of a fundamental failure to understand basic economics and/or a deep lack of empathy or realism on the part of national leadership.