If you click on the link in the thread, there's an editor's note clarifying that this paper is being used to prop up dodgy claims, for which there's no evidence. The main issue I have with the 'lab leak' theory is that I haven't seen much evidence one way or another. Hitchens' razor applies- what can be stated without evidence can be as easily dismissed without evidence. I personally don't see any issue with the idea…
I think this is missing Occam's razor - many people believe it because they've seen more evidence that it is true than the reverse, but they aren't necessarily good at judging evidence.
It doesn't make much difference either way. Given the number of people in the world, it seems likely we're going to see similar waves of disease in the future. The Asia-Pacific region has been on high alert for exactly this happening for 20 years, this could easily be a 1 in 40 years pandemic or worse as the world keeps getting smaller. And if it is even half plausibly a lab leak then given where tech is up to it takes one lab anywhere with bad safety standards - this is almost a level of risk that is hitherto outside the human experience.