It doesn't have to be true. Even if it is incontrovertably proven that there was no poisoning, Milosevic will now be a martyr.
Anyone having any exposure to the Balkan mentality will understand why. I have seen arguments going back-and-forth between Serbs, Croats, Albanians, Turks, Greeks, etc. First and foremost is the tribe. And when they don't have members of other tribes to hate, they happily commence hating each other.
The ultimate quagmire.
Well in this case it just may have the inkling of truth which will indeed make Slobo (the least deserving of all) martyrs. But if true a martyr none the less.