Shanghai's huge outbreak of Covid-19 seemed to coincide with the Winter Olympics. That event was "closed loop": outsiders isolated to specific venues. Yet the outbreak happened. So I am skeptical that closed loop business meetings would be practical in China at this time. Why can't they use Zoom?I don't think the idea of closed loop business areas are not practical.
I also mentioned this a while ago based on the Olympics experience. There weren't any outbreaks related to the Olympics, so it can be done. Of course the demand would probably be outrageous.