Specifically it was the Lenin segment on whether communists should participate in bourgeois elections, where Lenin argues that communists should participate by organizing as a communist party. They will have no expectation of winning, because bourgeois democracy is a myth, but it will be useful to spread propaganda and explicitly to show that bourgeois democracy is rigged.
Saying this means “LENIN WOULD HAVE VOOTED FOR BIDEN” was one of the most pathetic things I’ve ever seen, and the bar for liberal politics streamers is already in hell.