The presence of the drug was confirmed during the autopsy, I think that qualifies as a fact.
That Milosevic wrote to the Russians about the presence of this drug in his system is certainly a fact that can be verified. We have someone asserting that it is true and no one denying it.
And how do you know what the fact are?
I don't. I said the report was biased due to statements the writer included himself, as others here have also observed.