The furin cleavage sites have now been pretty decisively debunked.
They're found not only in many other coronaviruses, but they've independently evolved over 6 times that we know about, and they've now been found in SARS-CoV-2 related sarbecoviruses in bats.
The goalpost moving has migrated to arguing that a couple of sequences in the furin sites are now "unusual". Kristian Andersen, whose early 2020 e-mail to Fauci has been passed around as evidence of the lab leak theory has more recently talked to the NYT about this:
> Furin cleavage sites are found all across the coronavirus family, including in the betacoronavirus genus that SARS-CoV-2 belongs to. There has been much speculation that patterns found in the virus’s RNA that are responsible for certain portions of the furin cleavage site represent evidence of engineering. Specifically, people are pointing to two “CGG” sequences that code for the amino acid arginine in the furin cleavage site as strong evidence that the virus was made in the lab. Such statements are factually incorrect.
> While it’s true that CGG is less common than other patterns that code for arginine, the CGG codon is found elsewhere in the SARS-CoV-2 genome and the genetic sequence[s] that include the CGG codon found in SARS-CoV-2 are also found in other coronaviruses. These findings, together with many other technical features of the site, strongly suggest that it evolved naturally and there is very little chance somebody engineered it.
And "surprising genome snippets" don't get you past the fact that the closest known relative to SARS-CoV-2 is still decades of evolution away from being SARS-CoV-2 which is not something that can be engineered in the lab.
See this article for a lot more:
https://newrepublic.com/article/162689/bats-covid-19-lab-lea...