I didn’t read the book, but the premise has other proofs. For instance, there is a concept that each posuk in the Torah represents a year in the history of the world. BTW, there are less than 6000 Pasukim.
When I heard of this concept, I started checking some key years in recent history. Sorry I don’t have a Hebrew keyboard so I will have to transliterate.
For the year 1938-9, the beginning of the holocaust, the posuk is; “VaYechar Af Hashem…..”
This in no way absolves anyone of the evil they chose to do to us. It just means that Hashem withdrew some of his protection and the barbarians acted as they chose.