Isn't this a little strict? I went to monasterypodcast.com, but had to change the webguard settings to 17 to be able to load a podcast of benedictine nuns chanting the psalms. Why would this be on a forbidden list?
Due that it is dealing with something that is questionable in nature ( in order words, politics). But if you go to apple support site for podcast you may request for them to review the content in question. The web guard gets the rating from the 3rd party provider, once it has been reviewed it may no longer be rated NC17.