Buddy i am already read it first look the date of the news and if you miss this part so read it again
In early March 2009, One Chinese PLA Air Force Pilot sucessfully made a forced landing of one J-10 fighter due to the air shut-down of AL-31F engine. As one kind of single engine fighter, J-10 is very dangerous when power system in trouble.
As a result, PLA Air Force has been knowing the stability of Russian engines and just imported AL-31F engines before the finish of WS-10 development. But the fact shows that the WS-10 engine just looks advanced but has no real advantages to AL-31F.
If they are still importing Russian engine then how can you claim that their new version is ready and already installed in their aircraft .
I read the time. At the time, the fleet with WS-10 was grounded. But, now we have photographic evidence of J-11B flying with WS-10A.