If that's the case then perhaps China decided not to experiment with any LHDs just yet probably both due to the immaturity of the necessary helicopter designs and the costs involved in having yet another class of large ships.
If they are building these LPDs then it means they are building a ARG of MEU type force, that also means they will need a air group or air component, the LHA/LHD would give PLAN the air component while the LPD would provide the bulk of the ground combat element
The whole lot would need a logistics element to form the whole Marine Expeditionary Unit so far China is about 1/3 or 1/2 way there
In the coming years I hope PLAN can build 3 x CSG and 3 x ARG which means at anyone time they could have deployed 24/7 a single CSG and single ARG somewhere in the world that would be a reasonable force for China and a very powerful force
Only China and USA can afford these types of forces and only they could sustain them over the years for a prolonged period