That's precisely my guess also. Some but not all theologians felt that Trent defined it. I bet of these 25 theologians, only about 10 of them do more than mention it in passing, simply taking it for granted that BoD is there in Trent.
One of the arguments I've heard against my intepretation of Trent is that well, all the theologians hold that Trent taught it. It would appear not, based on this.
I'm definitely not a theologian, and I haven't been to seminary, so I could just be wrong/dumb, but I kinda agree with you on Trent (even though I believe in BoD) for the same reason I *disagree* with sedes on the whole "if anyone says the vestments and ceremonies of the Church are incentives to impiety" thing.
Here's the thing, from my perspective. Councils are called to address *specific* issues that are troubling The Church. Trent was predominately convened to deal with Protestantism. Protestants (at least some of them) were saying *faith alone* was sufficient to save. So the Council is saying no, you've got to have baptism, or you've *at least* got to have the desire/intent to go for baptism. So I don't think its intending to anathematize people who don't believe in BoD, its just saying you have to *at least* desire baptism (ie. its not faith alone, in the Protestant sense.) So neither "Feeneyites" or not are being anathematized, Prots are.
In the same way, when I say "whoever says the vestments, ceremonies, etc. are incentives to impiety", I'm, again, seeing thata as an anathema on Protestants who think the *Tridentine* mass or *any* mass is an incentive to impiety. They think worship is supposed to be "simple" with no liturgy, but instead centered around some Protestant preacher preaching a sermon and maybe symbolic bread and wine. There are plenty of Calvinists and Anabaptists who think like this "liturgical garments and ceremonies bad." I *don't think* the intent of Trent was to rule out the idea that infiltrators could screw with the mass and promulgate a bad, Protestantized mass through large segments of the Church for a few decades, regardless of whether such people think the infiltrators are *bad* popes *or* non popes. I don't see how either is what Trent had in mind. Trent had Protestants in mind who were against the mass and liturgical garments en toto.
Do you see what I'm saying here? Lemme know if that makes sense and then lemme know where you think I'm off base.