He seems to think Hitler was a socialist (!). A rather bizarre right-wing trope often used to attack the left.
Be careful. If the rest is up to that standard it won't be worth much.
Anthony Beevor's Stalingrad is a terrible, compelling read from a real historian. The main event was always in the East with unimaginable suffering & loss of life. Eventually the Red Army prevailed, destroying the vast bulk of the Wermacht and saving Europe from the nazis. Then the US saved Western Europe from Stalin...