Yep, sounds backward to me, too. And I can't pretend to understand it. Thought it was fascinating, though, that there was a natural fission reactor on Earth that ran safely, unattended for 150 million years!
How do we know it ran safely? Like, who was monitoring it? No animals died from its radiation? No fish suffered cancer?
This is (pun intended) a very old story, but to use it as evidence of anything is kind of silly.