I am surprised you are linking to Immanuel Velikovsky, whose theories have been rejected as profoundly ahistorical and fantastical, and who wrote at the height of the 20th century Biblical skepticism, when a lot of archaeological explorations had yet to vindicate and reveal the history of many ancient sites.
I'm not surprised that you know absolutely nothing about Immanuel Velikovsky, who has never been credibly refuted, only abused by left wingers like Harlow Shapley and Carl Sagan.