That’s an overly cynical view in the context I mentioned above. Lenin was advocating for more language rights and cultural self-development opportunities for the non-Russian peoples of the Russian Empire years before he had any glimmer of hope of seizing power. At that time, the “authoritarian single-party regime” that leftism in Russia opposed was the tsarist rule, which didn’t permit any local autonomy until after the 1905 Revolution, and even then only grudgingly.

Sounds like it's just something he personally believed in, then. Using a communist rationale I could argue that actually no, the proletariat of Russia and of Patagonia are one and the same, and should speak some common tongue (even if one besides their native one) to foster cooperation and solidarity.