True but by then we already had Yoshinkan, Yoseikan, and Shodokan.
The highest ranking non-Japanese currently living and training in Japan under the Shodokan umbrella has a near viceral reaction to any mention of the book. He came to Japan over 25 years ago and as he puts it "a true believer with the bible under his arm". Techniques are just techniques, pictures are just pictures, colour is just colour. What he found out (I fortunately read the book after I had arrived and studied in Japan) is that there is much in that book that has no relation at all to the Aikido of his (or my) teachers. I've come to understand that it just isn't my teachers either.