The original point was that Dawkins is no great shakes at philosophy.
It would have to be, since the point you used as an illustrative example is a sizeable pile of steaming horseshit. Great for the roses, but nothing else.
As for Dawkins: given that philosophy isn't science and doesn't adhere to the same canons of empirical evidence and therefore proof and disproof, there's no law that says trained academic philosophers are the sole proprietors of philosophical thought. Dawkins is as free to make philosophical arguments as I am or you are. Those arguments stand or fall on their own merits
qua arguments, not on who makes/made them. They may be good arguments, they may be bad arguments or some mixture of the two; but if you're going to hold up any particular one as an example of a bad argument, pick a better one because the last attempt was crap.