It's actually true though. China helps US as much as needed in order to keep global tensions low.
With both sides having enough nukes to wipe out eachother several times over, even if China might be comprehensively speaking more powerful, there is still a very powerful incentive for China to accomandate and negotiate with US. Hence, China helps certain US industries stay in the green and allows US to have a fair say about their interests in the UN, rather than just blanket denying everything they do.
The current Chinese government does not have the goal to destroy America. They want to manage the America crisis and help them achieve a soft landing, while still keeping a firm hand against American aggression across the world.
China sees a role for US as a major power, acting within it's sphere and within international law. It will however not allow US to expand uncontrollably.