Secondly you discuss the lab leak theory at length and construct the state of being that because not A it must be B but there is no dichotomy here, there are many choices, including the fantastical which break Occam's razor but alas may turn out to be true. Simply because we have not found a wild host does not make lableak "true" or even more likely.
I have no idea what the origin is. I'm not in the field, I'm not competent to judge. What I read suggests most people who are competent to judge want more evidence.
If your point is that the CCPs exclusion of external verification of theories is proof, I'm sorry but it's just not proof: there are many reasons why the Chinese government does this, guilt is not a given although fear of guilt is plausible. Shaming the state is not easy or wise for people in this political system and "Strong China" Plays inside the government and the party (they are different things btw) as well as differences between ministries, departments, provinces, external parties make this a very complex problem.
Power struggles often have nothing to do with the ostensible reasons they are fought over.