I did. I would need a lawyer to better understand what exactly we can extract from those denials, but this is what I can say for sure: all 3 of those companies

I did. I would need a lawyer to better understand what exactly we can extract from those denials, but this is what I can say for sure: all 3 of those companies would be extremely damaged by the public thinking this story is true. AWS considers security to be its single most important job and if the public discourse were to become cloud=supply-chain vulnerability, it would be devastating. This is clearly an existential threat to SuperMicro. I can't say as much about Apple, but from the outside it looks like they believe security/privacy to be one of their core brand strengths. Whether the article is true or false, I would fully expect these companies to minimize the impact of this article to the full extent they are legally able. I would need a legal opinion to understand if their denials would put them at legal risk were the article to be true (in which case I would be much more inclined to believe their denials) and whether their denials tell us anything about potential government gag orders (if the article is correct about a top-secret investigation, I would imagine they would have legal obligations around what they can say). I don't want to use false equivalence to make it seem like I believe this article is as likely to be true as not (I think it's unlikely or at least extremely misleading), but everything I can see from my not-so-informed position is consistent with both a true and a false article.