Summa,
I think we have had this conversation before. If it was clear (to someone who knew all the facts) AT THE TIME of the geirus that the priest was insincere, or if the priest had told someone what he was planning on doing, then maybe the kabbala would be invalid. Otherwise it would be a good geirus that the “priest” would have to “live” with in the next world.
Simply saying I am incorrect without providing a source, is close to pointless.
HakunaMatada,
I have been through various secondary sources (i.e. Shailos V’Teshuvos) on this sugya. I will freely admit that I did not learn up the mekoros in Shas. I have not seen any posek (other than R’Shlomo Goren, who did so to be mattir mamzeirim) that was mevatel geirus (in theory or in practice) performed on the auspices of a competent Talmud Chacham on the basis of after-the-fact conduct.