Sacrosanctum Concilium or, Sanctimonious irreconcilable differences.
Just kidding. The Novus Ordo is the Mass - but some people don't see it that way. Fr. Z posts photos here which may explain why.
That said, the Novus Ordo, aka Ordinary Form of Mass is still the Mass. It's the Mass all the popes since Vatican II have celebrated. It's the Ordinary Form for the Latin Rite.