From the way you phrased this, I think You may have missed the context link a couple comments above. Everyone is aware of what hubris means and that it's not a virtue per se. The point of the linked page is that it's (somewhat tongue-in-cheek) taking three vices and positioning them as virtues in a narrow context. It's just semantics; the saying could easily have used synonyms that have positive connotations, but using negative words instead is part of the joke.
Merriam-Webster - hubris - "a great or foolish amount of pride or confidence"
It's just a synonym used for arrogance and smugness. Humbleness is a virtue.