The WHO investigation DID NOT eliminate this theory. From what I remember, while the WHO was investigating, one member said "it didn't come from a lab". Then when everyone returned to their home country, some members suggested that it was possible - and I don't think their official report opined on it coming from a lab.
The official report isn't complete yet, but at the press conference, it was clearly stated that the team as a whole viewed a lab leak as extremely unlikely. More recent statements from team members have elaborated that that was a unanimous judgment of the scientists on the team.
