It would be rather weird for PLAN destroyers to lack a stand-off ASW rocket.No, the Yu-8 at this stage is only known to be used from the H/AKJ-16. We have not seen any imagery suggesting a rocket launched torpedo is in use with UVLS on any platform.
I suspect PLAN will want to keep UVLS clear for air defence, antiship and land-attack ordnance, but this is my own speculation. Type 052D and 055 can still perform ASW via embarked helicopters or in self defence using their deck-mounted launchers.
It is far more plausible to assume that such a weapon/capability exists and simply hasn't been shown in public yet.