One of the main claims that the Chinese turncoat is making is that the bat virus which is used as a reference and hypothetical source for where Covid-19 evolved

One of the main claims that the Chinese turncoat is making is that the bat virus which is used as a reference and hypothetical source for where Covid-19 evolved from (RaTG13) is _also synthetic_. I haven't seen any media try to verify or disprove this claim. Does anybody know any more about this?