Terrorists Wiped Out By Plague?

So apparently an Al-Queda group has been wiped out by the Black Death/the Plague. What is curious is the article is basically optimistic about the situation, portraying it essentially as divine judgment. It would seem to me that the most likely reason for the terrorists being exposed to it would be an attempt to weaponize it, which, though the plague can be treated, should hardly be downplayed.