At this moment I think that the question of whether or not China's modern DDGs are capable of engaging a great number of aerial targets simultaneously, really shouldn't deserve so much attention. The fact is that there are much more important issues waiting to get addressed.
From what I have read on the internet, the AAW abilities of China's modern warships (such as the 052c) are still limited only to point defence, while it should have been a true area defence force capable of providing air cover for the entire fleet or other surface ships.
I will quote couple of lines from the article "China Naval Modernization: Implications for U.S. Navy Capabilities — Background and Issues for
Congress" (which I probably got it from strategycenter.net).According to this article:
"A comparison [of the AAW system on the Luyang II class destroyers] to
[the] U.S. Navy Aegis [combat system] is inevitable, but Aegis was on [the U.S. Navy test ship] Norton Sound for nine years of development testing prior to the first installation on the USS Ticonderoga (CG-47) 20 years ago. Developing the software for signal processing and tracking a hundred air, surface and submarine targets will take even longer for China. Integration to various indigenous ship guns and missiles and other sensors, as well as other ships’ data management and weapons, will take longer. These Chinese “Aegis†ships may be limited to 1940s era radar tasks of detecting and tracking air and surface targets for their own ship weapons. Further in the future will be an 8,000-ton DDG that is predicted to be a true area control warship with additional Aegis capabilities. It is now in early construction stages in the new Dalian shipyard."
