That statistic would be even more violently pro-nuclear -- you need to dig up roughly 20 000 times more coal than uranium to produce the similar amounts of energy, assuming a steam thermal coal plant and a light-water nuclear reactor. If you swap that light-water plant to an advanced heavy water plant like CANDU, that multiplier goes up to about 2 000 000 times. A fun fact: the extractable amount of energy in the trace radioactive elements (notably thorium) that is dug up with coal (and mostly distributed into the environment) is several times higher than the extractable energy content of the coal.