I wonder if this is a good point to be made against the paper's claims, given that viruses like MERS-CoV are not exactly proven to be natural in origin and even

I wonder if this is a good point to be made against the paper's claims, given that viruses like MERS-CoV are not exactly proven to be natural in origin and even about HIV a lot of similar claims have been made over the years: Gunnveig Grødeland, vaccine researcher at the University of Oslo, is one of the scientists voicing their disagreement with Sørensen. She explains that what Sørensen referred to as "inserted sequences" can enable the development of a more serious disease, but this is not unusual in nature: "Examples can be found in other viruses including subtypes of influenza (including "bird flu"), HIV, and several human coronaviruses (MERS, OC43, HKU1)." https://www.forbes.com/sites/davidnikel/2020/06/07/controversial-coronavirus-lab-origin-claims-dismissed-by-experts/ https://www.forbes.com/sites/davidnikel/2020/06/07/controver...