Isn't it absurd to demand scientific evidence inside guardian article about book? Their articles never link to scientific articles and it is odd to expect this one to be exception.
I can’t tell if you’re being snarky or genuine. I rarely read “the guardian” but if you’re going to claim “reams of scientific data” exist, I’m going expect a link to something, or a quote from the book, or anything to back up this claim. Whether it a a tweet or a random book review.