Although bats carry many coronaviruses including SARS-CoV, a relative of SARS-CoV-2, direct evidence for existence of SARS-CoV-2 in bats has not been found. As highlighted by our data, the binding strength of SARS-CoV-2 for bat ACE2 is considerably lower than for human ACE2, suggesting that even if SARS-CoV-2 did originally arise from a bat precursor it must later have adapted its spike protein to optimise its binding to human ACE2. There is no current explanation for how, when or where this might have happened.
La última frase desmonta completamente el tuit. Basta con leerse el pdf que enlaza él mismo. Pero es que hay más:
Based on our data, the similarity of Pangolin-CoV to SARS-CoV-2 in the spike RBM could be a case of convergent evolution of the two viruses
Given the seriousness of the ongoing SARS-CoV-2 pandemic, it is imperative that all efforts be made to identify the original source of the SARS-CoV-2 virus. In particular, it will be important to establish whether COVID-19 is due to a completely natural chance occurrence where a presumed bat virus was transmitted to humans via an intermediate animal host or whether COVID-19 has alternative origins. This information will be of paramount importance to help prevent any similar human coronavirus outbreak in the future.
Vamos, que no. Que no dice eso. De hecho dice que no se sabe de dónde ha salido.