You’re completely ignoring the contradictions present within China itself here. China still has a capitalist class, and it is still in the primary stages of socialism with the workers having established a class dictatorship over capital, but China is far from abolishing existing relations right now. The collapse of the west is certainly a prerequisite for the transition to any higher stage of socialism, but it will be a long time before relations start meaningfully changing with China itself, let alone the rest of the world.