No. The saintly Pope Pius said is should be published. His decision was wrongly overridden. Read the Poem with an open mind.
A similar approved title for Mary is C0-Redemptrix. We must be careful in this respect: in Latin co- means "with" and doesn't mean equal to. Christ is the Divine Redeemer. Mary forever remains a creature. She is faultless by the grace of God, but creature nonetheless.