No, I think Earnest is saying that just because we can't think of a solution to a problem doesn't necessarily mean there is no solution.
It's as if nothing surprising has ever happened to an atheist, or they've never been wrong footed in their life. Haven't we all had the sensation of believing we fully understand a situation, only to find out later that we completely misunderstood what was going on? If these things happen every day in ordinary life, can we really rule out the possibility that God knows more about goodness and free will than we do?