I had suspected that Amazon's original action was more likely to be an error than a genuine branding of these books to be inappropriate. It just seemed unlikely to me that after a more thorough investigation Amazon would find either of these books worthy of pulling from sale. Of course, I would still wonder what would be worthy of pulling from sale, but that's another discussion.
I'm very happy for the author and I hope that's the end of it for him.
Regards
Caleb