I can see China having the capability of building that 9 carrier fleet, but constructing the air wings and training all the crews will be a significant challenge. What makes more skeptical though is that I just can't see a use case to justify all this expense. The US needs a lot of carriers because it wants to permanently station multiple carriers all over the world. This has a significant toll on the ships - making only about a third of them available at any time, and a significant toll on the crews. I have a hard time envisioning a world where the PLAN would want to have a carrier battlegroup in the Indian Ocean and another one in the Eastern Pacific at all times, so what would all these carriers be used for?
I think that there's only a use case for having about 6 carriers total. If we limit the STOBAR carriers to a purely training role, then that would bring up the total to 8, but that's going to be a fairly hard limit outside of a wartime scenario. Another thing to note is that the PLAN isn't in a hurry to build up to this number. Training the crews is going to take a long time anyways, and getting it right is a lot more important than getting them quickly.