Does it mean the 3rd 052D has been commissioned ?
well, a lot of fire power in one spot
Typically, ships would conduct sea trials from a naval base prior to commissioning, and we've had pictures of new ships in sea trial without pennant numbers docked at naval bases, doing just that.
We haven't had suggestions or rumours that D3 is commissioned, so it is almost certain that she is there just for sea trials at this stage.
Of course, we can confirm that D2 AKA 173 is commissioned given it has a pennant number and we've had rumours of it commissioned. I don't think we've had official confirmation yet, but that isn't unheard of.