Pretty much this
While, yes, the Soviets very well could have won the Cold War by heating it up early, you have to remember these are pretty much pipe dreams and alt-history scenarios. Stalin's main concerns at the time were to cuck to the Allies at every turn, not world communism. Even in Eastern Europe, what would later become the Warsaw Pact was more of a proxy zone to secure every potential route into the USSR in case of an invasion.
The way the USSR could have won the Cold War would have been to avoid it entirely along with WW2, if things had gone a little bit different in Warsaw, 1920 we'd be living in a completely different timeline.