Without L-L, the Germans will still need millions of troops for the Eastern Front,
They still won't need quite as many as they did OTL. They also won't need as many replacements in men and material the East, at their casualties will be much lower, which means those replacements can be sent west instead. There seems to be an odd assumption here that Hitler will be happy to act as the West's shield against the Soviet Union while still at war with the Anglo-Americans. He wasn't and didn't act that way at all.
The Germans were fighting harder in the East when the tide started turning against them. Here, that does not change, but Allied air supremacy in the West mitigates any German advantage in the West resulting from a weaker USSR in the East.
And this is a neat case of that mythologizing I was talking about. Air power did not prevent the much weaker German western front of OTL from dragging out the Battle for Normandy for two months, costing the WAllies tens of thousands of casualties, and then further hold ups along the western frontier of German which cost the WAllies even more casualties and time. It ultimately still fell upon the WAllied ground forces to defeat the forces of OKW and that will be the case ITTL. So no, WAllied air power will not prevent the additional German reinforcements too the West from inflicting additional casualties upon the WAllies and slowing their advance. Air power alone can't win ground wars
I think in the absence of pro-soviet propaganda, it would be unremarkable that America and the UK were NOT sending supplies to the, until fairly recently, Nazi Allied Stalinist Soviet Union.
The WAllies would be able to hide the realities of the Soviet contribution and what that means about as well as they could hide the dark side moon.
if the question came up in a setting that was not suppressible with war time censor ship, citing fears of a WWII part b, with a Soviet Union that was just as expansionist as the Nazi prior to the war, (if more sane.)
The memory of most of that was gone even before the Germans invaded the USSR. People viewed the Soviet Union with apathy up until June 22nd. And citing a speculative scenario about what the Soviets might do in the distant future that isn't at all apparent, particularly in 1941-43 when the Soviets are still deep within their own territory, is not going to impress a public who are facing the very real and imminent prospect of their sons, husbands, and fathers having to die.
A later Soviet collapse leads to a Nazi advance and MORE territory to occupy and larger fronts to protect and longer supplies lines.
But does not require as many forces. The Germans simply don't need as many troops without a Red Army to engage in massed conventional fight. The number of German forces deployed in the West will then number in the millions.
I wasn't trying to exaggerate the impact of Air Power, but I was thinking about an interview I saw on a documentary with a German who was transferred from East to West.
And he discussed how, even though they were losing ground on the East that they still had contempt for the Russians.
Sure, the Germans were convinced to the very end that the Soviets were inferior soldiers. But then they also thought that of the WAllied soldiers.