If Bloomberg's reporting is/was, in fact, entirely false then why wouldn't Amazon/Apple/Supermicro immediately sue them for libel/defamation?
From my lay understanding, Supermicro has a slam dunk case given the impact on their stock price.
At least in the US, I don't think this is true. Defamation is a broader class that includes libel, and always requires proving that the publisher was at least "negligent" in publishing the false statement: https://www.law.cornell.edu/wex/defamation