That paper is really frustrating - it seems to be written for laypeople like us, but conflates the theory that humans made a containment mistake and COVID escaped from a lab so (we should make research safer) with "COVID is an intentionally engineered bioweapon, so we should stop researching."
And the most critical claim in the paper is not substantiated in any way:
> Gain-of-function research is also subject to intense scrutiny and governmental oversight, precisely because of the high risk involved in conducting it safely; thus, it is extremely unlikely that gain-of-function research on hard-to-obtain coronaviruses (such as bat SARS-like coronaviruses) could occur under the radar.
Or substantiation is hinted at but never delivered:
> This work produced some of the strongest corroborating evidence that SARS-CoV-2 is a naturally emergent pathogen, as serological surveys demonstrated that people living in close proximity to colonies of bats had antibodies to bat SARS-like coronaviruses. The NIH has since set impossible conditions for restoring the grant, ensuring that this research will never resume.
Maybe the next place to go is learning more about the initial results from the EcoHealth Alliance grant referenced in the above quote. Still, it's a pretty unsatisfying review.
[edit, fixed typo: containement -> containment]