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…
Say mr X was seen at the crime scene at 10 am, he also knew the victim and lots of people have seen them fight a week ago, the victim had just came out of the bank with 20k$ in cash in a bag, mr X who's broke have been seen driving a car a month after the crime worth 18k$.
There is no evidence mr X killed the victim, but he probably did it.
Your argument removes probability, we have many coincidences linked to the lab leak theory, we don't have a 100% evidence that supports it, so we can assume it probably leaked from the lab, maybe it didn't, and since we can't quantify it with precision and a certain negligible error margin, we can use a language where probably happened means >50% and maybe happened means A woman can safely assume her husband is cheating if she catches him flirting with girls online, find a different long hair on his coat everytime he travels for work, etc.