So the evidence corroborating Goebbels supports the 1940 idea, despite Nazi ammunition dating 1941 was found, along with German rope, Nazi execution modus operandi, eyewitness reports corroborating that it was the Nazis that did it, and there's tons of discrepancies from the anti-communist Yeltsin-regime released documents. Sounds like more proof that the Nazis did it. All this is is you taking a declarative stance that you trust the Nazis and the Red Scare-era west against modern historical investigation.

As for the soviets, they tended towards 2 directions: 1, national sovereignty and self-determination, as well as 2, support for socialist movements. They weren't imperialist like the US is, so they didn't stand to gain from the same economic compulsions that drive the US to plunder the global south.