The academic background of the author of this book, "Dr Edward Dutton", is Theology and Religious Studies:

https://edwarddutton.wordpress.com/

Quite how that qualifies him to write a book on evolutionary psychology is anybody's guess. I'd give his claims about as much credence as your racist uncle forwarding "studies" regarding the supposed tendencies of his least favourite ethnic groups.

But self-consciously "alternative" news sources will seize on anything that they use to claim their biases have a rational basis, rather than an emotional one, I suppose.