I'm not persuaded this is how Trent is meant to be understood.
Trent is condemning the Protestant error that the vestments, ceremonies, etc. of the Catholic Church are harmful, in other words "we should go back to the primitive forms of doing things without vestments and ceremonies."
I don't think Trent has in mind what we should think if what appears to be the hierarchy appears to promulgate a Protestantized Rite of mass.
Condemnations of the NO are, if we take the NO to be a legitimate rite, still condemnations of the vestments, ceremonies, etc. of the Catholic Church.
Trent didn't specify "Only Protestants are condemned if they call the ceremonies of the Church calls to impiety" or "Only those are condemned who call the Tridentine/Latin/Whatever Rite a call to impiety" or anything of that sort. It made a very general statement:
CANON IV.--If any one saith, that, by the sacrifice of the mass, a blasphemy is cast upon the most holy sacrifice of Christ consummated on the cross; or, that it is thereby derogated from; let him be anathema.
CANON V.--If any one saith, that it is an imposture to celebrate masses in honour of the saints, and for obtaining their intercession with God, as the Church intends; let him be anathema.
These two canons obviously apply to all Masses of the Church, otherwise Trent would be saying it's a-ok to call Eastern or Maronite Rite Masses blasphemous, which is ridiculous. Trent is clearly saying that the Masses of the Church and the ceremonies, vestments, etc. it uses to celebrate them cannot be blasphemous or calls to impiety. This is because the Church is the Body of Christ and the Ark of Noah. It exists to glorify God and save souls. The Church cannot institutionalise blasphemy or encourage souls to sin, or at least unwittingly partake in great sin, through its sacred liturgies and ceremonies. To do so would be a total defection and failure in Her mission.
It is absurd to say that a true Mass of the Church could possibly be blasphemous, and it's not just 19th/20th century theologians saying that, but rather the dogma of an ecuмenical council.