Assuming an actual lab leak at WIV, from a US project similar to the one rejected by DARPA. And PRC is aware of all these facts.
Under these assumptions, this story/rumour could be seen as a threat, which re-emerges whenever PRC feels under pressure: "We won't go down alone for this"
My point was mostly that we won't really be able to figure out the microbiology details of it in order to make reasonable conclusions. I think it would be like trying to figure out the physics of the nuclear bomb during the Manhattan project, and concluding no such bomb can be built because no physicist has figured out nuclear reactions yet.