The CCP has been preparing for a long time. They know the real battle is one of public opinion and policy making in the US. The big resounding lesson from Ukraine is that an invasion must be swift and overwheling with careful logistical planning as well as PR and anti-sanction measures.
The worst possible thing China can do is attack a US target like a ship or a plane. It will be like pearl harbor, losing all that precious intel network capacity in the US along with US voter's opinions.
All of Europe and Asia can combine forced and will still likely lose against the US military in any conflict. But even the smallest nation can win if they manage to change americans' opinions.