The others seem to either have no comments or in one case (the Montagnier one) to be more of a distraction. If I missed any other actual threads, please let me know.
I know your focus is generally pointing to prior discussion. Just to be clear, I'm looking at the evolution of the story itself, at least as reflected through HN submissions (survival bias noted).
Wuhan lab did research on bat viruses, but no evidence of accidental release - https://news.ycombinator.com/item?id=23070031 - May 2020 (76 comments)
Experts disagree on whether Covid-19 could have leaked from a research lab - https://news.ycombinator.com/item?id=22695825 - March 2020 (6 comments)
The others seem to either have no comments or in one case (the Montagnier one) to be more of a distraction. If I missed any other actual threads, please let me know.