Unfortunately, though the book is mostly footnoted, the author gives no source for the claim of fabrication, which I nonetheless tend to believe. He says that the hand was constructed by Sidney Lenz and first appeared in The Bridge World as part of Culbertson's never-ending search for publicity. It has since been reproduced many times. If someone has the latest Bridge Encyclopedia, I am curious whether there is any mention of the supposed hand being a construction.
Too bad Hercule Poirot wasn't on the scene with the police; he would surely have reconstructed the hands accurately, even though the tricks were gathered rubber-bridge style. Yes, I also recommend "Cards on the Table" to those who have missed it.