My understanding is that SARS-CoV-2 has novel amino acid sequences (eg. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7114094/ https://www.ncbi.nlm.nih.gov/pmc/a

My understanding is that SARS-CoV-2 has novel amino acid sequences (eg. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7114094/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7114094/). Shuffling genes from other viruses wouldn't achieve this. The original article doesn't seem to address this directly. But I'm not a virologist. Perhaps you know more about it than I do.