The seal of the confessional can be changed to apply to the lay penitent and the priest. Priests already put themselves in a elevated position so "breaking the seal" is only reasonable. I don't expect them to do as such but...
By the by, it has always been the case that the priest can give instructions to the penitent to confess such crimes to the police as part of their "absolution". Technically, if they don't, then their sins are not absolved. I understand it seems like a pointless distinction, but the penitent that is foolish enough to admit these things in the confessional, apparently finds some importance in this distinction. Technically, within the RCC, forgiveness involves something similar to the twelve steps and involves admitting the sin and requesting forgiveness from the person wronged. AA calls it "making amends". Truly the proper result of a priest making these confessions should be both a requirement to express regret for their actions, beg forgiveness from the wronged, and going to the police to face the consequences.