A friend who knows the scene writes: First, their findings run counter to classic theory with respect to depression caused by inbreeding. Second, no beneficial mutations are discussed, only benign ones, and then deleterious mutations of varying degrees. Much as in Michael Behe’s Darwin Devolves.
Thing is, it was never clear exactly what the mechanism is supposed to be for animals to try to avoid mating with kin. So it’s no surprise that most aren’t really doing that anyway.