If Super Micro knows they didn’t do it, they should absolutely love the story. Buyback the underpriced shares and make a ton of free money once the market realized the Bloomberg story is false. I don’t know if they actually did that, but that’s what I would have done. I didn’t actually do that because I trusted Bloomberg a lot. But there was substantial profit to be made as an insider. I bet many/most employees made that trade, at the very least.
It could also be the case that it never happened but Super Micro doesn't know for certain that it never happened. They may be pretty sure it never happened but unable to rule out the possibility that some portion of their organization was compromised by an intelligence agency.