Uh, I don't think you understood their point. Tankies aren't communists, they're authoritarians with a red paint job. We're not talking about nuanced Marxist thinkers, we're taking about people who think "Just line everyone who doesn't accept my exact interpretation of communism up against the wall" is rational praxis.
There are plenty of ways to rationally arrive at Communism, but really the only way to get to Tankie is, as the top comment says, rejecting Western propaganda in favor of the propaganda of so-called "communists".