Here we go again!
It's a joke! Horses can't produce viable offspring from jackasses, because they're offspring are sterile (donkeys). Coyotes can't mate with Foxes because their chromosomes don't add up. They can't mate with dogs either. I mean, we could go down the list, but the theories being espoused are unshaky ground at the very least. More guessing and theoretical chicanery.
Dating ruins, bones, fossils, by the different forms of carbon decay or radioactive decay is extremely shaky anyway. This particular site pointed that out not too long ago. Rainwater falling through the atmosphere can pick up isotopes from solar flares along with other sources, even volcanic eruptions. And, or, live organisms, either microscopic or close to. This seeped down through the faults and crevices to skew dramatically any particular dating process. Everyone wants to be a genius, when in actuality, all it takes is a little bit of common sense. The data is already there, and it's been produced by individuals who are not creationist. By the way, the Earth definitely is billions of years old, that's without a doubt. But what has been created on it, is not! There have been many epochs in time, each spanning millions of years. The fossil records do not show the evolutionary stepping stones from 1 to another. New species and new types of life appear en-Masse each to its own epoch of time.