I have finished reading this book on Kindle and will give a summary below.
His underlying argument would appear to be that before the first exile, in the 6th century BC, all the events took place in Yemen and the southern part of the Arabian peninsular. This explains why the route of the Exodus, the pharaoh of the Exodus, etc., have not been identified and why Biblical Archaeologists have so much difficulty in actually locating any Old Tetament sites. Misraim, Jerusalem, Pharaoh, etc., are references to small places in Yemen and their local chieftain.
As I said, the argument shows merit, but the presentation is very poor. The book is free if you subscribe to Kindle Unlimited, so maybe one of my readers will venture their own opinion?