John of St. Thomas teaches that heresy separates one from the Church per se, or quoad nos. One cannot be deposed merely per se or quoad se, but one is only deposed if it is per se and quoad nos. For one to be deposed, he must be deposed quoad nos, or he is not deposed.
Loss of office ipso jure, according to the letter of the law takes place by the fact alone of public defection from the faith, which takes place when the heresy is public, and cannot be hidden, nor excused by any subterfuge of law. It doesn't matter how many or what percentage of the hierarchy or laity believe he is or is not a heretic. What alone matters is the fact of the formal heresy, which must be public according to the canonical definition of "public". By the fact alone that the public defection from the faith, (according to doctrinal/canonical understaning of "defection", and the canonical definition of "public" as defined in can. 2197), has taken place, the loss of office occurs ipso jure, as the Code statutes. It matters not what the majority, most of whom may be clueless, might believe.