When I was writing my piece where I theorized that Malachi Martin wrote himself into his book, Hostage to the Devil as "Father David", I relied on Martin's books and his radio interviews with Art Bell and the set of interviews he gave Bernard Janzen. Never did I come across an admission that Martin was definitely one of the priests under pseudonym in his book that has 5 accounts of exorcisms. I was just working off my own deep-reading of the text, and the fact that the Malachi Martin who wrote the heterodox Jesus Now seemed an intellectual replica of "Father David" who, before he performs an exorcism, is wedded to wrong ideas about Christ, nurtured by an infatuation with Teilhard de Chardin.
I had not yet listened to the Hostage to the Devil podcast, hosted by Marty Stalker who directed and co-wrote a film about Malachi Martin that was released in 2016.
In the past week, however, I listened to the Hostage to the Devil podcast because I was looking for interviews with people who had known Malachi Martin so that I could refute the false notion that Father Malachi Martin had never done exorcisms. In Episode 1 of the podcast, I heard Bob Marro hold forth on his time as "Malachi's driver", the man who drove Martin to all the places along the eastern seaboard where he went to exorcize people of demons. Bob Marro's great affection and love of Martin shines through, he says of his time as Martin's chauffeur, "I was always happy to do it, because I got to spend hours and hours and hours with him." Martin became Bob's best friend, and according to Bob, Malachi Martin admitted that he was one of the priests under pseudonym in Hostage to the Devil.
There are several other exorcists in Hostage, but none other than "Father David" have the exact same conversion story as Malachi Martin, from devotee of Teilhard de Chardin to Traditional Catholic priest.