Chances are they are going to keep them. Who would buy the piece of crap book without the pr0n?
The book is already obscure enough in the West. If they take away another incentive, no one is gonna get it.
Well, the article says they're basing it on the RN version of the game, whatever the hell that means....
And, well, adding porn makes it more interesting to some, but many of the Western FSN fans are interested in it through the anime rather than through the VNs, and the Western attitude to porn and nudity (especially the US) is far more strict than Japan's is, so a lot of people will not buy it if it has porn in it even if the rest of the book is interesting.