China does have a problem with organ donations, having the lowest amount of organ donations or replacements. This primarily stems from low organ stocks and weak or low amounts donation programs. This can perfectly explain why the organs were cut from the bodies, leaving only bones or an empty husk of a body. Perhaps a group of some sort was running an organ black market? Maybe even the government, considering how well hidden and how many bodies there were in those concrete tubs. It sickens me how corrupt and ignorant people are these days, this is a serious matter and people should definitely look more into it.
Formalin (AKA: Formaldehyde) is an embalming chemical often used in taxidermy to preserve animal specimens. It appears that was what was in the glass bottles. Someone brought Formalin with them when they came back to dump more bodies, and emptied jugs of Formalin into the pool to lessen the smell and limit animal activity.
This is why he’s able to withstand the smell, as well as why the bodies haven’t been reduced to skeletons after 11 months. You can see in the second video that the upward facing body close to the camera has had its face eaten by rats, but its body below the water is more intact. If the bodies had been dumped in just water, that pool would have turned into rotten sludge within a couple of months, and the smell would be noticeable from outside the lab.
It’s the use of preservatives that has slowed the decomposition rate, causing an unusual buildup of adipocere for a body submerged in liquid. Usually that isn’t seen in “wet” bodies, which would typically bloat and collapse, while these ones retained their basic body shape without significant bloating.
By the way: The other comment here belongs to the chinese propaganda machine.