Earlier quoted context omitted.
It could be that you're confusing cause and effect, though. How do we know that the virus (or a precursor) wasn't already circulating in China, and was simply detected in Wuhan because of the fact that there are experts in coronaviruses who reside there? (Also I'm not entirely sure your statement about the gain of function research is correct. A Google search doesn't seem to provide any evidence one way or another.)
There's so many attempts to muddy the waters it would be funny if it wasn't so serious. Even though I'm not sure you attempted to do that here, it certainly reads like it. So, basically, you're saying that (many, we know how contagious covid 19 is) people got sick and put into hospital/died with a novel respiratory disease in another (or several other) chinese cities first. However, that was covered up or unnoticed _…
What China and the CCP wants though is to have this debate centered around if it was lab produced or not. They can rely on western scientists to debunk the lab created hypothesis. That leaves their own theories about it originated in Italy as the standing theory for their own domestic consumption. And that avoids looking at their animal farming practices and keeps them from having to crack down on that whole economy, which would be highly disruptive.
And this keeps factory farming conveniently entirely off the radar as a cause of this pandemic. The next pandemic could easily be a virus that hops to humans from pigs or chickens in the USA. All the yelling both ways about lab origins is a very effective smokescreen to avoid doing anything to prevent a future pandemic. NOTHING will happen to prevent future pandemics over yelling about lab causes other than making some people in America very, very angry about China. What we should be doing is thinking about factory farming practices and reducing our diet of meat and animal products.
This would mean that we might have to admit that the insufferable vegans were right all along, and then change our own behavior -- so its much easier to just get super angry at China.