This info tracks with what I’ve been told first hand by someone that just flew it. They also had the “never again” qualifier.
One thing that’s being left out is the Sani-tabs you have to throw in the toilet and let mellow for at least an hour before flushing. There were multiple articles investigating COVID19 spread in Chinese high rise sewer pipes. Apparently the required field hotel doesn’t have a plumbing water seal between rooms/floors. This setup was attributed to the spread of COVID19.
Here’s an article that addresses the potential danger of a common plumbing vent line which seems to be the standard technique in China.
https://waterandhealth.org/disinfect...-sewage-pipes/