No, the Germans were fighting in the Atlantic
U-boats hardly contributed to war in Russia?
over the skies of England
Nope, they shifted forces from BoB to Russia.
as well as continental Europe (the beginnings of the western allied bomber campaign).
You're kidding right? A few Blenheims?
So yeah now that we established that Germans had some submarines and a small expeditionary forces in Africa we can say they devoted all of their available resources to fighting Russia.
Active two front war begins with Sicily in 1943, prior to that Germany is fighting Russia and Russia only, everything else is a total sideshow.
Your source implies that Axis forces melted by more than half a milion which is...a joke? I understand there can be a huge disparity in claims but lets not quote extremes?
Russia at the time of the winter offensives has 1.5 milion soldiers to Axis 3.2 milion, in early 1942 five new armies are formed with a grand total of 1 milion men and reinforced to a grand total of 3 milion by the fall of 1942, thats according to Berlitz, Porwit, Szymański and Tormasov in their respective works.
All throught 1942 Russians are outnumbered, they bring 2 more milion men to the party in early 1943, a milion more in 44 and the six milion figure is the amount of active troops till 45, to Axis 4.2 milion active troops.
But in late 41 till late 42 Russians while still having more equipment are numericaly inferior.