Allow me to be more explicit in my understanding: Why do you believe an excommunication can be lifted after the death of the individual?
My understanding is that the penalty of excommunication *ceases *with the death of the individual, simply because the effects of excommunication become moot at that point.
Can. 1331 §1. An excommunicated person is forbidden:
1/ to have any ministerial participation in celebrating the sacrifice of the Eucharist or any other ceremonies of worship whatsoever;
2/ to celebrate the sacraments or sacramentals and to receive the sacraments;
3/ to exercise any ecclesiastical offices, ministries, or functions whatsoever or to place acts of governance.
§2. If the excommunication has been imposed or declared, the offender:
1/ who wishes to act against the prescript of §1, n. 1 must be prevented from doing so, or the liturgical action must be stopped unless a grave cause precludes this;
2/ invalidly places acts of governance which are illicit according to the norm of §1, n. 3;
3/ is forbidden to benefit from privileges previously granted;
4/ cannot acquire validly a dignity, office, or other function in the Church;
5/ does not appropriate the benefits of a dignity, office, any function, or pension, which the offender has in the Church.
Which of these privileges do you believe could be enjoyed by a dead person?
I repeat as well: I could be completely mistaken in my understanding, and welcome correction if so.