China pays personnel way less and a huge chunk of that budget is personnel costs
They also have different goals. America spends to maintain global hegemony, which means a huge fleet of aircraft carriers meant to operate around the world. China isn't (yet) spending in that way, they're a lot more focused on regional objectives.
China has invested rather deeply in the space of carrier-killer missiles, which are cheap enough to build that it will always be possible and economical to sink any carrier, including Ford class