WWII historiography, particularly that of the Russo-German part of the conflict, has always been bedeviled by strong ideological pressures. Some of it stemmed from the historical loathing many western observers had for the USSR in general, even before the war. Some of it arose from the peculiar circumstances of the Cold War, which exacerbated feelings on all sides. And of course there was the pressure from the Stalinist state to make sure the record only reflected glory on Mother Russia. But there was also, then and now, a strong strain of “Wehraboo,” that emerged immediately after the war and, while it ebbed and flowed over the years, still remains strong.
Hell, I remember playing wargames in gaming clubs in the seventies and eighties with people who would refuse to play the Russians in any WWII game, who always had to play the Germans, and who would simply not stop talking with great enthusiasm and the zeal of the convert about how the Nazis were misunderstood or how they were infinitely better than the vile Russians, etc.
I have no idea about this particular work or author, but it would not surprise me to find out that this is yet another in a long string of efforts to recast the Second World War to the benefit of the Reich.