The fact that infrastructure was built under state capitalism does not demonstrate the superiority of central planning, only that capital accumulation occurred despite intervention, often financed by prior scarcity, foreign savings, or coerced transfers; absent market prices and entrepreneurial profit-and-loss, the state cannot know whether the infrastructure created was the most value-productive use of scarce resources, only that concrete and steel were poured.

I think it demonstrates the increased variance of central planning. The Congo Free State was also centrally planned, and so was the Holocaust, the Holodomor, the Armenian Genocide, Suharto's mass murder of suspected PKI sympathizers, etc. But the expected outcome for poor countries is that they stay poor and don't develop into industrialized export giants the way my laundry list of countries did.