Is China still importing the diesel engines for these ships from Germany ? Or have they indiginized those as well.
Are you talking about diesels for 052D? I'm pretty sure the powerplants for all of their surface warships are produced indigenously now (destroyers, frigates, corvettes, LPD, LST, carrier).
In fact I can't think of any current indigenous in-production naval ship that is using imported powerplants.