You cannot take that "support" out of the context of the decisions made by communists. Without the efforts made in "Mao-era" china, agriculture, industrialization, education, etc., the reform and opening up would likely have gone differently, china would probably look more like India and Brazil. And during (and after) reform and opening up, china actively steered the economy and set priorities, they continued to hold, as dessalines points out, the commanding heights of the economy, and used 5 year plans. So yes, you can say it was the "support" (capital) that came into china which made them richer, but only in context.