This is no different that apps that are rejected from the app store for some reason or another.
It's been pretty well established up to this point that apple censors content on it's stores. The fact that this is written content, verses other types of content (AKA code), is irrelevant. If the apple gods don't like your content, kiss your spot in their store goodbye.
It sucks, but this is the way apple does things, and I seriously doubt it's ever going to change.