Reddit reviews Lenin on the Train

I think you can absolutely make that argument! In fact, it's been recently made in book form here. As Merridale argues, without Germany's role in Lenin's return, the USSR would not have existed.

More to the point, the German role in transporting Lenin was part of a broader plan to foment revolution in Russia, topple the provisional government, and ensure Russia withdrew from the war. This was the only plausible path to victory the Germans had in 1917. And in the short term the plot was very successful, although it backfired dramatically in the ensuing decades.