A lot of people are unaware of how anonymous sources in a serious news organization work. Here, it means that the multiple high-level intelligence officials described in the article are known to and vetted by Bloomberg. They've looked at their resumes and bona fides, and confirmed their backgrounds. They're just not revealing their names to us.

So which is more likely: that multiple intelligence officials are making this up, or that Apple/Amazon/Supermicro feel obligated to lie because this is an ongoing classified counterintel investigation?