Actually Creation Scientists were way ahead of the curve on this one. These conclusions look more like pre-designed characteristics that only express when the environment dictates.
A. E. Wilder-Smith did some extensive research in this area. He got the idea when thinking about callouses. A recessive trait that is coded to only express when the environment dictates. He did some other experiments along these lines.
One included a male frog species that had a rubbery pad on it's front feet. The pad enabled the frog to grasp the slimy female in order to reproduce. When he forced the environment to be dryer the pads no longer expressed for the males.
He decided to experiment with other species who lived in dryer climates. The male frogs, when forced into a swampy environment expressed the same rubbery pads on their front feet.
His conclusion is that scientists don't know enough about genetics to make competent claims. It all makes more sense from a design perspective and with the current momentum will be viewed in that light by more scientists as time progresses.
That is the worst description of calluses I have ever seen. I think it's just flat wrong.