The Nazis were Sunshine soldiers only. Got it. That also explains why they prevailed in North Africa.
False Comparison on your part.
One can be beat by superior tactics and better leaders on the other side in North Africa and lose to a nasty winter in another region of the world.
The point is, the lend-lease agreement is objective data, and it gave the Russians equipment, tanks, aircraft, and on and on, and the Russian winter killed so many Germans the Russians never laid a hand on, thus also objectively verified.
Battlefield heroics claimed by Russians is hardly objective data.