Except, as previously established in quotes from their writings and speeches, Marx and Engels specified how the Revolution was to be lead by an organic revolt of the masses lead by the masses. They explicitly rejected the Bolshevik concept decades before it even came into existence. Your interpretation is only further validating my point that Marx is simply ignored by the left and everyone else. The left has resorted for a hundred years of, "Well, Marx didn't mean this." "If Marx had known better, he would have said this. "Marx didn't explicitly say otherwise." The modern left is inherently Post-Marxist.
"It’s a folly to characterize the Russian Empire as non-industrialized"
I agree, this is Marx and Lenin's characterization, not my own. Once again, Marx was wrong.
The phrase “organize themselves as a class” with respect to the “proletariat” is purely militaristic, particularly with respect to calling for a revolution to “make themselves the ruling class”, which is a coup d’état. There is no such thing as an “organic” alternative, whatever that is; please don’t attempt to insert neologisms.
If the left is somehow “post-Marxist”, it can only be due to Marxism per se being an anachronism.