The Americans don't want a decentralized world because they'll be one of many great powers in it and they won't get to boss others like they used to. However some realists are seeing the writing on the wall and they realize unipolarism is just not sustainable, even Trump and his delusions is starting to see this. So what some of them want is to split the world in two and let both China and the US have their spheres of influence, this allows them to consolidate power, forge stronger military and economic alliances and then go at China at a later time. In short, they want to run the old Cold War playbook because they figured since we won that one we can win another one fighting the same way. They'll present this enticing offer to China because they think the Asian thinks like the European who is constantly looking for subjects to dominate.
I'm not Chinese and I'm not a member of the CPC but from what I can see I don't believe the Chinese leadership wants a bipolar world, it doesn't serve China's long term interests. I believe they want to decentralize the world and dilute the US and the west's power within it. You can still be influential but the days of one country or a small group of countries that will sit down and decide what others should do, what forms of government to practice, what economic model to adopt, etc should come to an end. The world should be multilateral, where sovereign countries deal with each by other conducting mutually beneficial deals and nations can be members of different groups with overlapping interests. I think the Chinese leadership has learned lessons from the Cold War and is adamant not the repeat the same mistakes the Soviet Union made.