Subsequent evidence debunked that "post-mortem", as another user posted.
We've seen, with evidence, China pressure research groups and Nature into calling the lab leak hypothesis a conspiracy theory. Like "fake news", "conspiracy theory" is now actively used by China as a way to shut down evidence.
From subpoenaed communications we even know that certain figures who publicly denounced the lab-leak theory as a conspiracy, privately believed the theory was likely.
https://www.wsj.com/articles/the-covid-lab-leak-deception-an...
Government covert operations are not the kind of phenomenon science can properly study because it's not reproducible and data is not open. It's the realm of investigative journalism and intelligence.