The Liaoning is gradually working up towards its air wing.So I think we can assume that either the footage was a mix of old and new clips or that theres still some prototype fighters although the carrier has its air wing
I believe that the prototypes will probably still be used now and then for various tests.
At the same time, it is clear that production J-15s are now appearing on the Liaoning.
They are using these to train pilots and slowly, carefully work up to having a full squadron of active J-15s with trained pilots for the carrier.
This year we may see them with as many as six to eight aircraft aboard. Pictures of six to eight J-15s operating off of the Liaoning would be really nice to see.
To date, the most we have seen are four.