I think if you had read the text in that ad, you probably would have known the answer to your question to me.
That animal is a cross involving a gray rat snake and a corn snake. I do not, and will not, knowingly work with hybrids or intergrades with my corns.
Now, that being said, I bought a bunch of animals from a guy by the name of Andy Barr years ago that he was calling Frosted Corns. I had several snows and Anerythritics from him. Neat looking animals, especially the Snows, but the more I worked with them, the more I became convinced they were not pure corn snakes. So I asked Don Soderberg if he wanted them and sold them to him for a lot less than I paid for them as hatchlings. I have no idea what he has done with them, but they looked like Snows that had yellow streaked all throughout the body. If they had been pure corns, they would have been interesting to work with, but that's the way it goes, I guess.
Oh yeah, one other thing. There is NO Motley in that blood line, so there is no Motley Snow shown in that photo.