Its not credible: two viral lineages emerged from the market ~1 week apart before the world knew what covid was; they differ by 2 nucleotides; mutation rates are 1e-6 per base per passage; doubling time is about half a week. A group of sick animals better explains the phylogenetics w/ these constraints. Everything points against lab leak: location, timing, and genetics.
It really boils down to: do you trust a brutal communist dictatorship that has been attacking the West asymmetrically and wants to invade its neighbours to be honest?
Multiple Western governments believe it was a lab leak and coincidentally I'm sure, relations with China have been quite bad since.
If you want to deny sequence data that predate worldwide recognition and controversy related to COVID-19, OK. But the origin question can never be answered with this denial.
Here's a good article that's basically a summary of events (as well as teaser for a book): https://www.thestar.com/news/insight/from-our-lab-to-theirs-...