People always allude to this, and it's true an adversary could (probably, maybe) sink one aircraft carrier. That same adversary wouldn't sink a second.
> Back in reality, it's true [China] could ... sink 15 aircraft carriers [in an hour].
That is unlikely. The Chinese military relies on a combination of overwhelming manpower and tactical positioning, not aircraft superiority and tactical missile deployment (although they are equipping with more and more ballistic missiles). This puts the US at a distinct advantage in almost every conflict with the Chinese military. This includes the South Seas.
The presence of the 5 US carriers* off Singapore has deterred the staged Chinese invasion force for the last few months
I was going to say China would use submarines for such, but they don't appear to have many (in contrast to USA) [1]. My next consideration would be China's red team (APT) but I'm unsure about aircraft carriers being hackable. I mean, it'd make a great fiction novel, perhaps a sequel to Cryptonomicon. Where does China's military strength lie?