You literally dont know what imperialism is

Imperialism is the subordination of external markets for the extractive benefit of an overlord class in the core

It requires total control over a nation's foreign, legal, financial and military policy to undertake a conscious and planned underdevelopment and deindustrialization policy

Its also requires centralization of local capital in imperial hands, export of said capital to the core, tiers of citizenship, unequal legal rights, enclosure movements, enforced segregation and racialization of populations

None of that describes Mao's China, but it does describe the majority of euro/anglo states during the twentieth century