It is true that there are a few priests in the TAC that are validly ordained. Cardinal Ratzinger had the responsibility of determining the validity of Anglican priests that wished to become Catholic priests. I am quite sure that as the pope, that he is well aware of the fact that there are a few priests in the TAC that may have received valid, though illicit, Sacraments of Ordination.
If the TAC ever does decide to be reconciled with the Catholic Church, the members of the TAC are going to have to receive all the Sacraments of Initiation, and not just the Sacrament of Baptism, just like any other Protestant that converts. The Anglican Use parishes within the Latin Rite of the Catholic Church is the model to which the TAC should be looking at, not pipe dreams of Rome recognizing the TAC as being something other than a Protestant sect like the Methodists, Lutherans or Southern Baptists.