Well, as I said, it's similar to the scenario where a penitent perhaps forgot to mention a mortal sin (not deliberately withholding). There's a valid absolution, so the Sacrament was in fact confected. So I think this is not quite the same thing as BoD.
The problem with your reply is, forgetting to mention a mortal sin, was not the purpose for providing General absolution. Forgetting to mention a mortal sin, one needs to get back into the confessional, and explain to the priest they forgot to mention yada yada. In the meantime, if the penitent truly forgot and dies before he/she got back into the confessional box, the Mercy of God, ( the forgotten sin would be forgiven by God) As I was taught back in the day, my Catholic school prior to VII.
It might help if you looked up Canons below yourself:
What, then, is the purpose of general absolution, which involves the granting of absolution to a group without the priest having heard each person’s individual confession of sins? Canon 961.1 explains that there are two situations when it may properly be used.The first (c. 961.1 n.1) obtains when danger of death threatens, and there is insufficient time for the available priest(s) to hear the confessions of everyone present. The most obvious situation in which this might happen is a time of war. Imagine, for example, that Sunday Mass is being celebrated in a parish church that is more or less crowded with parishioners. Suddenly, planes are heard overhead, and bσɱbs begin to fall. It is quite possible that the church may be hit and everyone inside killed in a matter of moments. At that point, the celebrant of the Mass would rightly move to give general absolution quickly to the entire congregation.The second situation (c. 961.1 n.2) pertains to circuмstances which are less extreme. It involves a “grave necessity,” described as a large number of penitents and an insufficient number of available confessors, such that there is no time to hear everyone’s confession, and the faithful would be deprived of the grace of the sacrament for a lengthy period of time.