China's sees imperialism vs anti-imperialism is the primary contradiction in the world, and that the imperial core countries will never have revolutions until they no longer materially benefit from the resources they take from the periphery.

China's position on sovereignty will strengthen the periphery countries until they are strong enough to resist imperialism, at which point the imperial core will lose their resources. When this happens the core countries will not accept the loss of profit, they will pursue it elsewhere and the only place to pursue it will be to cannibalise the core. This cannibalisation will result in the conditions for revolution in core countries.

China is maintaining complete consistency on their sovereignty position because it's supposed to lead to the conditions necessary for communism to win.