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Of course, why should it not be valid? It was approved by the Church, and to my knowledge, there are no elements that would make it doubtful. Even the so-called Ordinariate Mass is, in fact, better than the Novus Ordo Mass because it incorporates elements from tradition that are lacking in the Novus Ordo. In this sense, it can be considered an improvement over the Novus Ordo Mass.