It wouldnt be the first time that a J-15 is spotted with ws-10. But AFAIK, no such plane has landed in liaoning yet. I think that plan still doesnt enough trust with it.
I think J-15 prototype serial numbers 554 and 557 were equipped with WS-10s briefly before switching out to Al-31s.
If this is a serial production J-15 with WS-10s then it could most definitely be indicative of the navalized variant of WS-10 reaching the next stage of development -- after all, we are all expecting WS-10s to replace Al-31s as the J-15s powerplant in the near future, it is just a matter of when exactly.
If WS-10 really is powering new production J-15s, we should keep an eye out for any mass produced J-15s (preferably lined up on the tarmac somewhere) with nozzles able to be identified... and then later, we would expect them to land on Liaoning and conduct training from the carrier. However it will likely take a number of months until we get photos of it happening, if not a year, depending on how many WS-10 powered J-15s have been built, if any.