Stalingrad is solely Hitler's fault.
I wouldn't say that. That's swinging a bit too far into the other camp, the one dominated by Mannstein's
Lost Victories. To take Mannstein himself, he suggested that Paulus attempt to aid the breakout with two divisions IIRC.
Khalkin Gol also wasn't that lopsided; the Japanese simply allocated a piss-poor amount of resources to the battle, while Zhukov concentrated his forces to good effect.
It was mainly the kind of resources they deployed. Japan had a good army for what it did: light infantry, capable of marching long distances in poor conditions, relying on rifle fire and light artillery to succeed in areas where heavy artillery and armor cannot properly manuever: The kind of army you want to see in Manchuria, China, Malaya that sort of thing. It's not very well suited for Inner Mongolia, which the Red Army was much better equiped for.
The Soviet population was considerably more than twice that of Germany.
Ehhh, not so certain about that. After the Anchluss, the German Population was 88 million. Russia never reached much more (if at all) over 176 million.
I don't know which of the latter your Deathride author is.
John Mossier is just stupid. This is a man who wrote a book claiming that armored combat didn't
really change warfare that much, that Blitzkrieg (which he has no conception of, to the extent that it even existed, and he manages to confuse with
Strategic Bombing of all things) didn't work, and another claiming that Germany was winning WWI based on Demographics. Oh, and he also thinks land mines were invented in World War Two.
