From the same article:
> McBride and his co-authors estimated that individuals living near coal-fired installations are exposed to a maximum of 1.9 millirems of fly ash radiation yearly. To put these numbers in perspective, the average person encounters 360 millirems of annual "background radiation" from natural and man-made sources, including substances in Earth's crust, cosmic rays, residue from nuclear tests and smoke detectors.
Coal, oil, and even gas are dirty and dangerous. But they are investable and insurable, with less (but definitely not zero) government support.
I'm all for pricing-in the externalities. And if that makes nuclear a relatively better investment, hurrah! If new technologies turn nuclear into something supportable in normal capital markets, hurrah! But there is no proof-of-concept yet.
They, however, certainly downplay the tail risk of nuclear.