This is gold.
https://www.nature.com/articles/s41591-020-0820-9
"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 predicted7,11. 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 backbone20."
From an article published literally a week ago
https://www.newsweek.com/fauci-emai...article-debunking-lab-leak-hypothesis-1596727
In a separate tweet Andersen wrote: "As I have said many times, we seriously considered a lab leak a possibility. However, significant new data, extensive analyses and many discussions led to the conclusions in our paper.
Andersen told Newsweek the lab leak idea was "based purely on speculation" and he had not see any "credible evidence" to back it.
He said: "All statements in our article were supported by evidence available at the time, and they have only since been further strengthened by additional evidence, of which there is a great deal."
More likely he was tired of being harassed on twitter. Probably by idiots who read zerohedge for news.