The point of Bayesians vs. Barbarians is not that the Bayesians lose, but that true rationalists win against the barbarians where merely "clever" wannabes lose, and that we aspiring rationalists know enough about how they do it to win as well.

That only happens if rationalists actually implement advise like that contained in the post, instead of simply patting themselves on the back over that fact that "true rationalists" would win while still acting like "merely 'clever' wannabes".