Industrial technologies helped capitalist countries succeed just as much as communist ones but you attribute capitalist success to economics and communist success to the technology. Capitalism hardly uplifts, it sabotages the growth of previously colonized countries, extending imperial rule. Even in the countries on the benefiting side of that imperial relationship most of those benefits are going to owners and not workers. The exploited country could get most of the benefits with few of the downsides by just having an open trading relationship, but historically countries trying to achieve some level of self determination are met with a combination of military force, espionage, and embargos.