Is there any particular discussion you think we should be happening? My impression is EAs were concerned about lab leaks before, thought it was plausible but far from clear this was a lab leak, and continue to want more security for BSL labs in the future.
I think there are a lot of good reasons:
(thoughts my own)
People discuss this in private a bunch, doesn't seem valuable to discuss it in public unless someone has additional important-but-nonsensitive information.
Also in general there's various reasons (some very good, some meh) that biorisk people mostly eschew the EA Forum for serious object-level discussions, and prefer private online and offline spaces.
There's pretty suspicious circumstantial evidence that SARS-COV-2 came from the Wuhan Institute of Virology: https://www.vanityfair.com/news/2022/03/the-virus-hunting-nonprofit-at-the-center-of-the-lab-leak-controversy
EAs are really concerned about engineered viruses leaking from labs.
Why isn't the lab leak hypothesis discussed on the EA Forum?
I follow updates and arguments about the lab leak as a consequence of my EA-driven interest in biorisk. I don’t think that EA has a comparative advantage in shedding light on this hypothesis relative to those more directly involved in the investigation. I also think that it wouldn’t be that surprising from the perspective of common sense EA wisdom if the pandemic had zoonotic or lab leak origins. So not a ton of updating to do either way. This is why I don’t look to EA for information and analysis on this subject. Can’t speak for others.