I agree with Dawkins, and i don't think this is some bombshell of him admitting evidence of god. It's all 'could'.
Anything is possible, we could be planted and evolved by another alien race, we could be engineered by them, we could be a dream, a hologram, in the Matrix... we could be a fart coming out of the butt of the Bhudda... it's all 'could's' and not 'is'. Always fun stuff to think about. But when we jump to the conclusion of some fantastic explanation for things that make up us and our universe, we find out they are much less magic fantasies and more practical explanations. Our beliefs should be guided by what we know IS true. Always a safer bet, then you aren't blaming the god's for sending a comet to cause famine and so on and so on...