i don't think there is any reason to boast about it. It's been well know for a while that chinese shipyards have lower cost than other countries. The Koreans built KDX-3 for really cheap too. If you factor in the lower cost of weapon system, that's an advantage PLAN will have. fyi, 6 billion RMB is $900 million at current exchange rate. The design work is done by the 701 Institute, so I would imagine they got paid already. The 6 billion number should just be for shipyard building the hull + installing the electronics (but not including the guns and missiles if I had to guess). Of course, cost may go up or down as they start to build more.