That implies a pretty slick manufacturing section to build sufficient blocks to keep all 5 hulls roughly in parallel construction and the supply chain for all the necessary equipment. Fitting out five hulls at once will be interesting.
It is impressive, I still have doubts over build quality, but there is no denying they are looking for ways to rationalise and streamline production. It may even be an attempt to reduce costs - which would imply China is feeling some pinch from the building programme.