They start out saying that, but keep reading and "clearly show" becomes "is improbable": "It is improbable that SARS-CoV-2 emerged through laboratory manipulat

They start out saying that, but keep reading and "clearly show" becomes "is improbable": "It is improbable that SARS-CoV-2 emerged through laboratory manipulation of a related SARS-CoV-like coronavirus. As noted above, the RBD of SARS-CoV-2 is optimized for binding to human ACE2 with an efficient solution different from those previously predicted. Furthermore, if genetic manipulation had been performed, one of the several reverse-genetic systems available for betacoronaviruses would probably have been used19. However, the genetic data irrefutably show that SARS-CoV-2 is not derived from any previously used virus backbone." Their argument boils down to "it doesn't look like previously published work" (that's me paraphrasing, not a quote).