I have read Stanley's book and tested the Master Cleanse/Lemonade Diet. And i was happy I did.
I do remember that Stanley was not too crazy about other methods. Providing that The Master Cleanse works well, he probably did not care to examine whether his mathod could be combined in a way with other good methods.
So I do not interpret his oppinion as: "Don't do anything else". I is more like "Don't do anything else if you do not know what you are doing".
Stanley's book has been aond for some years now. There has been lots of new info since.
By the way, where can one find his book online? I wouldn't mind to have a copy, to send to my patients and friends.