The so called bio warfare lab is kind of an joint venture with France......(who told you it is a bio warfare lab ?)
Many things can be dual use.
However these labs are built to study viruses,
china has had problems with viruses escaping from labs in the past due to accidents or sloppy practices .
It seems a couple years back they were concerns about this particular lab.
If you look at the chain of events one could assume that they actually knew or had high suspicions of what happened.
In many information Sources note that the city was locked down but not air travel out of the city to other countries
Kinda strange. I wouldn’t place any nefarious reasoning to it, maybe trying to hide it, not understanding the implications in doing so.
Can check on this, from your perspective?
What happened in China is not unique to China, nor is how they responded to it.
The US and other countries working on the edge of science with highly dangerous studies all of had their own accidents.
The only difference is that in most cases they were able to contain them within their own borders for the most part.