That's not true. First of all, it was intended to be a multi-phased investigation. Now, the Chicoms won't let the second phase begin. Why?
Secondly, the CCP thwarted the investigation at every turn, even deleting data to cover it up. Lastly, even the WHO now says the investigation was shoddy. Tedros Adhanom Ghebreyesus, the director-general of WHO, acknowledged last week that there had been a "premature push" after the first phase of the study to rule out the theory that the virus might have escaped from a Chinese government lab in Wuhan, the city where the disease was first detected in late 2019.
https://www.hindustantimes.com/world...535964659.html
https://www.npr.org/sections/coronav...ab-leak-theory