Pretty quick, I'll give them that, but not before coverage - this is only a week or so before I became aware of the virus. Granted, I was traveling in China at the time, but it was known.
In my analysis I find these are examples of fitting events to predictions after the fact; the huge number of 'larp' threads on conspiracy forums allows for cherry-picking examples where some content later rhymed with reality.
[0] https://archive.4plebs.org/pol/thread/230585890/#q230593401
[1] https://archive.4plebs.org/pol/thread/141096258/#141102703
[2] https://www.snopes.com/fact-check/4chan-user-prediction-las-...
sponsored in part by the Gates Foundation and reported by the Washington Post and others, retweeted by Joe Biden.
This was not secret insider information.
[0] https://archive.4plebs.org/pol/thread/237746333/#q237746818 (Warning, this link contains graphic hate speech like much of 4chan does and is not suitable for human consumption.)