I am a full time golf instructor and my co-worker uses the extraordinary golf method. His student do not get better and many of them leave feeling ripped off. The reason the throwing motion is hard to get into an effective swing is that they are similar motions, but at the end of the day very very different. If you look at the people in the throwing club motions on video, they are out of position 100% of the time. Why? Because the release point is in a much different area. About 2 feet from the other release point.
I will say that there are many great things about the book, but over all it falls short of being worthwhile for myself. Shoemaker says that because people do not get better that the current golf culture is wrong. He says current golf instruction does not work and is not effective. That goes against statistics. 10% of golfers take 99% of lessons (or something close to that). Out of those golfers they report a 99% satisfaction rate. By that stat, the reason golfer do not get better is not from taking lessons, but rather not taking lessons.
One other big mistake Shoemaker makes in his book is this: he says that you must stay present. Then he tells you repeatedly to find a connection with the target. The target is the future. The current is you alignment, your grip, the wind, your aim etc. To only have target connection is like staring at the finish line in a race. Unless you move your legs fats you can connect all day long, but you will not win. All of sports science says that you do not focus on the outcome (target) you focus on the performance (swing) and the outcome will be achieved.
My personal belief is this: Information is not the enemy. Poor information is . I would suggest getting with a good golf instructor that is not method based and work on your swing flaws and learn you swing strengths. I personally hat not knowing why I am playing bad, and even worse why I am not playing good. Shoemaker's method does not educate you. At the end of the day the motion makes the shot not the target. Let mechanics produce and feel re-produce. There is a difference between feel and real.