> On the one hand, if true, all Bloomberg had to do was produce evidence; a single compromised server. They didn't.
If the story were true, under what circumstances could Bloomberg reports have come into possession of a compromised sever to satisfy this requirement?
> On the other hand, if the journalists fabricated the entire story
Journalists evaluate and report what they're told by sources. For instance: they don't do scientific experiments themselves, but rather interview scientists about their results and report their statements. Their quality control is to get multiple sources to corroborate each other.
Saying Bloomberg journalists "fabricated" the story is going too far. If it's false, what's likely is that either their sources were either mistaken or dishonest.