Jeremy Farrar, on Februar 2, 2020 (linking to his book):
On a spectrum if 0 is nature and 100 is release – I am honestly at 50! My guess is that this will remain grey, unless there is access to the Wuhan lab – and I suspect that is unlikely!
Jeremy Farrar, on Februar 2, 2020 in a email summarizing a phone conversation to the head of the WHO:
Critical that responsible, respected scientists and agencies get ahead of the science and the narrative of this and are not reacting to reports which could be very damaging.
Ralph Baric, on Februar 6, 2020:
Jim Hughes, Linda Saif, Hume Field, and I believe Rita Cowell will sign it, then I'll send it round some other key people tonight. We'll then put it out in a way that doesn't link it back to our collaboration so we maximize an independent voice.
While the full post is long, it gives many details about how they collaborated to suppress the lab leak theory.
So your/their assertion is that the 'lab leak' claims were always a reasonable exploration of the possible origins of COVID-19 (i.e. not a conspiracy theory)? If that's the claim, then the timeline I'd like to see is how the lab leak claims were being promoted at this time and what evidence was presented to support the claims to show that they weren't just baseless accusations.
Edit: I found a timeline of high-profile claims/accusations, published May 2020
https://www.forbes.com/sites/jackbrewster/2020/05/10/a-timeline-of-the-covid-19-wuhan-lab-origin-theory/?sh=7032a6705aba
Edit2: Some specific date:
Washington Times, Jan 26
"The deadly animal-borne coronavirus spreading globally may have originated in a laboratory in the city of Wuhan linked to China’s covert biological weapons program, said an Israeli biological warfare analyst."
Fox News, April 20
"There is increasing confidence that the COVID-19 outbreak likely originated in a Wuhan laboratory, though not as a bioweapon but as part of China's attempt to demonstrate that its efforts to identify and combat viruses are equal to or greater than the capabilities of the United States, multiple sources who have been briefed on the details of early actions by China's government and seen relevant materials tell Fox News."
The Wash Times article now has a 'retraction notice' of sorts, saying that it's clearly was not a biological weapons program. But that is the atmosphere within which Andersen et al were operating when they wrote the paper. The Fox News article is more reasonable, but vastly overstates the 'confidence' in the lab leak theory. To this day, evidence of the lab leak has not been released, and people just hang their hats on "well, we can't rule it out conclusively". It has never been the favored hypothesis among experts.