As mentioned in response to Amy above, I may be mistaken, but I think that they were just trying to make the point that procedural generation can be very easy, and doesn't necessarily require a team of PhD physicists.
EDO goea a bit beyond a height map and a shade of purple. The EDO stellar forge simulates the distribution of mass around a star, planet formation, the age and resulting number of impacts, plate techtonics and now sedimentary rocks and ancient dried up rivers. I've seen layers in the rocks, but not eveywhere, that's clever.