In my opinion the most damning part of the article is the section about the human-adapted furin cleavage, I recommend reading that part. The working assumption is that we should find people with precursors to covid without that furin cleavage adaptation, and we don't. If China wants to prove it wasn't a lab leak, they'll need to find instances of the virus that predated that adaptation- as was the case with SARS.
[0] https://thebulletin.org/2021/05/the-origin-of-covid-did-peop...
It would seem to me that shows it's not the "smoking gun" many people believe it to be.