The bottom line is we will never know, since China is not exactly a free country were potential eye witnesses can be interviewed freely. The market theory was always more likely and more dooming for China, though. It's easy to beef up the control of bio labs, it's way harder to close down all animal wet markets. Officially, China claims they have done the latter but I've heard that they continue to exist all over China.
Secondly, it was suppressed in the way that news media and Twitterati were labelling everyone considering this theory as a possibility to be racist because some racists they know also shared the same views.
"The market theory was always more likely and more dooming for China, though"
No, the most likely possibility from day 1 was that a novel coronavirus emerging right next to a lab doing experiments on novel coronaviruses came from that lab. It was always nonsensical to claim otherwise.
The other side just engaged in, labelling, name calling and ad hominem attacks which is what added credence to this theory in the first place..