That is the worst description of calluses I have ever seen. I think it's just flat wrong.
That was a fast and loose summary by me. He described the process using all of the technical terms. You will have to hear his explanation to properly comment.
He differentiated the callus and the frog pad. Calluses are coded to express and recess during the lifetime. If I remember correctly the Frog pad was more like Finch beaks in that new generations expressed the latent genetic information. Just like the Finch beaks the Frog pads fluctuated on and off depending on environment.
His main point is scientists are properly clueless considering the wealth of information they have not considered. And that what we do know contradicts all conventional theories in one way or another.
IMO this is where the new blood of Creation Science will come in. :-)