There are at least a couple of suspicious points in this study: First and foremost the central claim is that 5 potential restriction binding sites versus 2 means that SARS-CoV2 is non natural. That does not necessarily follow. Just as SARS-CoV2 is unusually infectious and damaging to humans it could just happen to have an additional 3 restriction binding sites. So there is nothing inconsistent with natural selection…
I strongly disagree. If of natural origin, there are a plethora of simple controls that could be implemented. Control doesn't necessarily need to be perfect. Some simple controls could be restrictions or bans on Commercial trade or transport of high-risk animals. If not of natural origin, it obviously indicates that BSL4 controls are inadequate or inconsistently applied. A simple but perhaps costly solution might be to not certify bsl4 Laboratories in dense Urban settings.