From Wikipedia:
"Co-Redemptrix is a title used by some Roman Catholics for the Blessed Virgin Mary, as well as a Catholic theological concept referring to Mary's role in the redemption of all peoples. It has always been controversial and has never formed part of the dogma of the Church. "This is not a dogma.
Pre-criticizing a non-dogma. Wow. The Full Cathy Newman!! 
Formal "Dogmatization" of any article of the faith generally doesn't happen unless dissent and controversy are threatening the unity of the Church.
Nonsense.
The Fifth Marian Dogma.
This would pretty much finish elevating Mary officially to a fourth member of the Trinity.
It's gonna happen because Roman Catholics want it to happen....not that it's Scripturaly sound in any measure and contradicts Scripture....but that's not stopped Roman Catholicism before.
You assert, wrongly, dogmas aren't made unless there is dissent and controversy. Rome's sources say different.
The Marian dogmas of her Immaculate Conception and her Assumption, for example, were solemnly proclaimed only after a lengthy petition drive from the Catholic faithful to the Holy Father. Before the papal definition of the Immaculate Conception by Blessed Pius IX in 1854, millions of petitions from the Catholic world were sent to the Vatican, with particular perseverance coming from Spain and its Catholic government. In the case of the Assumption, infallibly declared by Pius XII in 1950, over 8 million petitions spanning 95 years were documented by the Holy Office in support of this Marian dogma.https://catholicexchange.com/the-fifth-marian-dogma-the-churchs-unused-weapon
And the Fifth Marian Dogma, when it's proclaimed goes beyond the co-redemtrix blasphemy.
But I'll note another comment from the same wiki article you posted...and it's pretty telling.
In August 1996, a Mariological Congress was held in Częstochowa, Poland, where a commission was established in response to a request of the Holy See. The congress sought the opinion of scholars present there regarding the possibility of proposing a fifth Marian dogma on Mary as Co-Redemptrix, Mediatrix, and Advocate.
The commission unanimously declared that it was not opportune, voting 23-0 against the proposed dogma.
Say what....not opportune????
If it's true, it's true [in Roman Catholicism but not Christianity].
You assert it's not a dogma....but it has been proclaimed by Rome previously.
"Taken up to heaven she did not lay aside this saving office but by her manifold intercession continues to bring us the gifts of eternal salvation. ... Therefore the Blessed Virgin is invoked in the Church under the titles of Advocate, Helper, Benefactress, and Mediatrix" (Lumen gentium, 62).
The Roman Catholic has to again fall back on verbal gymnastics to avoid the clear meaning of words from their denomination.
Rome is so far off base on this it's very, very sad.
Thanks for providing a chart explaining why you do now waste much time defending your church’s position on things.
Indeed it is not dogma, except as evidently contended for by devout RCs, without correction from Rome. If only the principle of Co-Redemptrix" being disallowed by Ratzinger as solemnly defined since it "departs too great an extent from the language of Scripture and of the Fathers and therefore gives rise to misunderstandings” were applied to other Catholic teachings not manifest in the only wholly inspired substantive authoritative record of what the NT church believed (including how they understood the OT and gospels), which is Scripture, especially Acts thru Revelation.