You get it all wrong. Author has provided the credentials seem difficult to overlook & ignore and warned about some of the so called biased research in the past which has lead us to make up a very different mind set to stir the controversy now.
And looking at the vast historical literature (which forms a kind of only evidence as of now as nothing physical sort of evidence could be found for a matter of very ancient age , take any character even younger than that age Moses, Jesus etc). author suggests just don't blindly ignore it.