In the past weeks theories about the US Army creating and bringing COVID-19 to China during the Military World Games (Wuhan, October 2019) have arisen. This is not the first time claims that the virus originated in the United States surface (Zhao Lijian's tweet on March 12, quoted below).
... It might be US army who brought the epidemic to Wuhan. Be transparent! Make public your data! US owe us an explanation!
While this new claim regarding the US Army and the MWG 2019 appears outright ridiculous, I couldn't find much sources suggesting against it.
Is this theory currently provable, disprovable or undecidable?
About the suggested duplicate: This question focuses on the (so-said) transmission from US to China, while the other one talks more about originating from US.