It's an interesting photo. There's a heated debate on cjdby forum. Some suggested it's a Photoshoped photo. Whereas most seem to believe two hangers should never be considered for a destroyer of this size (6k+ ton) as that might increase the centre of gravity somehow, which in turn would compromise the stability.
But, one thing nobody with that thought has answered so far despite been asked a few times on that forum already is that how a hollow structure such as a hanger can cause the increase of centre of gravity when originally missiles and all the launching mechanisms were in its place.
I personally think it's another "religious" believe that tends to go around military enthusiasts. Well, one can always argue most navies don't value stability as much as PLAN does right now as not every navy is a "blue-water" navy. Then, how about the old Oliver Hazard Perry class frigate of the US Navy. It's the same size as PLAN's Type-054A (4k ton) and it has always had two hangers.
The German Navy has a consistent tendency to put double hangars on their hulls, ever since F122 Bremen class, which displaced 3,800 tons, and repeated that in every following class. So this is not accurate re stability concerns etc. Its purely a question of what a navy wants their hulls to do and how they can sustain such operations.