Wow, it's shocking to see such discussion on this fourm. I never expected this.
I reckon it became new potical correctness that if anything went wrong, it's must be the evil Chinese government?
I think the ground of the OP's hypothetical scenario is the law and regulation. Being the legal government (you like it or not) ruling the land, the Chinese and Hongkong government has every rights to declare temporary or permanent NFZ over the whole HK area. And DJI, as an entity operating under Chinese law and regulation, has to obey.
And is this something difficult to understand? Just as soon as Trump authority put Huawei to the Entity List, dozens of US-based suppliers stopped trading with Huawei. And Flex even went extra length not returning the equipment and materials legally owned by Huawei. And Github decided to block the code repositories of the developers in Iran, Syria and Crimea because Github does business in the US and thus is subject to US trade law.
Again, it's shocking to see such political topic eroding this nice and peaceful forum enjoyed by the drone hobbyists all over the world holding diffierent lives, religions and opinions in harmony.
Please remember, there are always so many different angles to interpret anything. A simple sentence of "You can beat me now" one may see bravery while some may sense provocation.
You may say, a drone footage may exactly provide an objective view on what's going on, then it has to show 360° on every little details at any given moment in order to avoid any misinterpretation. After all, the drones can only do Bird's View, not God's View.