He inserted those ideas - not his own and not because he advocated them, but to accentuate the fact that the current politically driven (PC)historic record leaves open too many questions that do not jibe with evidence at hand.
His book makes his argument in an entertaining and captivating manner. I highly recommend it.
Always interested in new ways of looking at things.
It is always good, however, to remember that absence of evidence does not always constitute evidence of absence.