This is just the same false claim that Josh Rogin made nearly a year ago. If you actually read the cables, they do not claim that the lab is dangerous or poorly run. They say that the lab cannot yet (as of 2018, before it opened) operate at full capacity, because it does not yet have enough trained staff. The lab was operating safely at less than full capacity. That's not surprising for a new lab that has not even officially opened yet.

The context is that the US diplomats were asking for continued US funding for a program that trained Chinese lab technicians. The people writing this memo were not even experts. They were diplomats, and were merely relating what their Chinese hosts at the lab had told them - that the US training program was important and should be continued. Rogin has been trying to twist that into a claim that the lab was unsafe, and that diplomats were raising red flags.