Yes, YOU are.
Which is part of the point. You quote St. Ephrem. Now, none of the Eastern (or for that matter Western) Syrians believed in the IC. For the Easterners, this is especially relevant, as they denied her the title Theotokos. Now along comes the emessaries from the Vatican after a millenium of hymn writing, theology etc. and part (the majority?) of the Assyrians submit to the Vatican and become Chaldeans. No changes are made in the liturgy, hymns etc except to stick the name of the pope of Rome in the commemoration. So they go off blissfully unaware that things have changed. Some of the brightest go off to Rome, where of course they emulate the ways of the big sister (as Rome didn’t give the Faith to Syria, mother sounds strange). When in Rome, do as the Romans do. So they pick up the idea of, say, the IC, along with other latinizations, and, eager to please, start reading it into things of their own tradition which they try to keep. Of course then, everything becomes crystal clear! Of course this referes to the IC! Ignoring, of course, that none of their forebares, who sang those same hymns, saw anything of the sort. Nor do those who remain outside of the Vatican’s jurisdiction (the situation for all but the Maronites), who, because THEY have not changed their theology, and because the Vatican breaks lex orandi lex credendi, sing the same hymns, don’t see the Vatican’s theology in their common hymns. So then the accusation is that these change their theology just to spite the pope of Rome, as if they care what he says or thinks. The projection of this obsession with the Vatican sometimes knows no bounds.
Btw. the dogma begins in England of all places (ironic in view of the English Reformation). The feast shows up there in c. 850, but the Immaculate part is not promoted as part of it until the 12th cent. by Anselm (Atonement Anselm)'s friend Eadmer, who defended English (he was Anglo-Saxon) folklore in a popular pamphlet, De Conceptione sanctae Mariae. Note, post schism. St. Bernard of Clairvaux 1090-,1153 Alexander of Hales, and St. Bonaventure (teaching at Paris, called it “this foreign doctrine”). The English persisted in spreading it, Duns Scotus inventing the syllogism potuit, decuit ergo fecit (God could do it, it was fitting that He did it, and so He did it) as its “proof.”