I keep thinking the title says "Autistic robots produced through evolution".
Anyway, to address the subject of Darwinian selection, which I suspect they used to differentiate it from "natural" selection, (and could have refined further to call "Darwinian-modeled selection) in a sense, it IS the robot's natural environment, as both robots and environment were created by humans.
And either way, it's really damn neat that the robots evolved in an unexpected manner.