I've found an article on that website, which is much more updated than 1999.
http://www.china-defense.com/naval/plaas/plaas_3.html
There seems to be a dispute over ships available. For example xinhui says there are 300 Type-67s. Though that seems to be true, from what I understand most aren't in service. If they're being stored well, maybe they could be put to use. But they are slow and vulnerable with limited endurance.
Same applies to the Type-68s.
What's the "Type 273" - I can't find any information on it.
Even so it still only says 53,000 personnel (though has just over 840 tanks). Then you have to remember that nearly half of those numbers would be sent over on slow, virtually undefended tin-cans. That's assuming they'd all be in working condition at the time as well. And of course this all assumes nothing gets sunk on the way over.
Not disputing what you said, but did some research myself into to the two mentioned types.
Type 67 and Type 68 account for 25,500 of those 53,220 troops. And that assumes 100% availability rates.
Type 67:
The Yunnan class Landing Craft Medium was
first built in 1964 and continued until 1972. A total of about 280 were actually produced. Around 40 are believed to still be in service with another 200 being stored in reserve.
Propulsion 2 diesels; 600 total hp
Length 28.6 meters
Beam 5.4 m
Draft 1.4 meters
Displacement 128 tons
Speed
12 knots
Crew 10
# Armament 4 x dual 14.5mm machine guns
# Capacity 1 tank or 2 vehicles, or 46 tons of cargo
Type 68
Propulsion 2 Type 3D6 diesels; 300 total bhp; 2 shafts
Length 80 ft 4 in (24.5 m) overall
Beam 17 ft 7 in ( 5.4 m)
Draft 3 ft 9 in ( 1.2 m) maximum
Displacement 35 tons light, 93 tons full load
Endurance 450 miles at 11 knots
Speed
10 knots
Crew 3 max. total
# Armament 4 x 14.5mm machine gun
http://www.globalsecurity.org/military/world/china/navy.htm
In other words small, flimsy, old (35+ yrs) and slow (10-12 kts) landing craft going open ocean, average crossing perhaps 120+ nm in open sea, towards a contested amphibeous assault. And 100% availability.
No way.
They are not going to arrive in an organised manner. They have low survivability, due to age and speed. Small packets of delivery ensures chaos at the beach head. Assault troops will be sick and fatigued after a 12 hr voyage in 35-128 ton vessels crossing open ocean. Risk of breakdowns due to old equipment.
These vessels are out.
And forget about civilian sealift for assault jobs.