Let's assume the ratios for LHD, LPD and LST are 1:2:4, the goal is to have 8, 16, 64 of them respectively in medium term. They're roughly at 50% of that goal.
RORO ships are dual use. The largest fleets are Bohai Ferry (11) and Hainan ferries (12) (between mainland China and Hainan Island) as well as others. All told, there are at least over 30 large RORO ships that can be used in a Taiwan landing contingency. Each RORO ship can carry up to 200 vehicles and 2,000 personnels at maximum capacity.
PLAN Marine Corps has six brigades (it appears that there is also another brigade on Hainan, to be confirmed) and one air assault brigade. Total number is approximately 40,000.
PLAGF has total six amphibious combined arms brigades, belonging to 72nd, 73rd, and 74th Army Groups respectively. Total number is approximately 30,000.
These PLAN Marines brigades and PLAGF Amphibious Combined Arms brigades will be used in the first waves, transported by LHD/LPD/LST.
These first-wave landing forces will be supported and reinforced by PLAGF, primarily from the 72nd, 73rd and 74th Army Groups, but possibly from other army groups too. These will land via RORO ships.
PLAAF Airborne Corps, which consists of total nine brigades including six airborne brigades (the other three are special force, support and transport brigades), may also join the landing. Their total number is about 40,000. They will land via Y-20/IL-76/Y-9/Y-8. They may have close to 100 Y-20/IL-76's soon.
The one thing I somewhat (actually, strongly) disagree with, is the viability and relevance of airborne drops in a Taiwan contingency.
The ability of transport aircraft to survive over hostile airspace -- especially in the early stages of a campaign -- is slim to none. I think tactical and strategic transport aircraft would be far better used in supporting and reinforcing logistics and supply on Chinese soil instead, helping to transport high priority materiel and personnel across the country, and also to help facilitate dispersed/agile aerial forces.
On a related note, the threat of MANPADS (also shown vividly in the recent events in Ukraine), makes me believe that large scale heliborne assaults against anything resembling a modern enemy, is very difficult to pull off, unless you have massive, laughably lopsided advantages in ISR and precision fires to support your landed force. Smaller scale insertions with helicopters may be somewhat more viable.
I agree with the LHD and LPD and LST ratio, though I think you meant 1: 2: 8, rather than 1: 2: 4 (if it was 4, then there would be 32 LSTs rather than 64).
I would also add, that when 076 enters the mix, I think a 1: 1: 2: 4 ratio of 8 076s, 8 075s, 16 071s, and 64 LSTs, could be a neat way of rounding the numbers.
Of course, in a Taiwan contingency, 076s may not be quite as important as the rest of them.
But as peacetime, blue water equivalent ESG equivalents, one 076, one 075, and two 071s would make a formidable package, and likely able to transport a good part of an army amphibious capable or marine brigade. In event of a Taiwan contingency, all they would have to do to reinforce it would add eight LSTs and they'd probably be able to carry a full army amphibious or marine brigade, perhaps even slightly reinforced.