Nobody brought up the USSR, and your linked comment has several issues, even as someone who is a critic of the USSR and does not wish to rebuild the USSR:

1. None of that fundamentally addresses the fact that Russia had higher rates of disparity both under the Tsarist Regime and under the Russian Federation than under the USSR: https://cepr.org/voxeu/columns/soviets-oligarchs-inequality-and-property-russia-1905-2016
2. The article you linked goes largely without citations, and both articles cited at the bottom of the article state that the USSR improved food production from an initial state of instability through investment in industrialization: “The paper summarises the East European experience with socialist agriculture and notes that while production often failed to meet plan targets (thereby giving the impression of a sector in crisis), there was steady growth based on substantial investments in buildings, machinery, fertilisers and irrigation systems which provided food for the population at affordable prices.”
3. The Marxist-Leninist USSR is absolutely NOT the only form of non-Capitalist economy. Market Socialism, Anarchism, Syndicalism, Democratic Socialism, and more all exist and can similarly solve the issues of inequality.

What is the point of your comment?