The nuns in the Congo story was a total fabrication that first appeared in a Jesuit magazine in the late 70s. This, in turn , was based on a discussion of hypotheticals that a moral theologian had presented (but certainly not supporting doing such a thing) in the early 70s.
The Congo war in which this supposed papal permission took place, moreover, was two years before Pope Paul VI was even elected pope.
On this day, February 21st, 15-years-ago Jorge Mario Bergoglio was created cardinal by John Paul II.