EWTN’s resident theologian writes on Malachi Martin:
"We get many questions about Malachi Martin, his books and his credentials. Not all of them can be answered due to an absence of information. The following is what is known.
"Malachi Martin states, and the Holy See will confirm if asked, that ‘In 1965, Mr. Martin received a dispensation from all privileges and obligations deriving from his vows as a Jesuit and from priestly ordination.’ [Congregation for Institutes of Consecrated Life and Societies of Apostolic Life, 25 June 1997, Prot. N. 04300/65]. Malachi Martin alleges that he has the permission of the
then Pope, Paul VI, to say the Mass in private. Although laicized priests are prohibited from performing the sacraments, except in certain cases provided for in Canon Law, there is no way to verify whether he has such an exception, and the Congregation would not necessarily know if the Pope verbally assured him he could celebrate Mass in private. Generally a man should be taken at his word unless there is evidence to the contrary.
…]
"Concerning Malachi Martin’s own theological tack it should be noted than on his World Wide Web homepage he accepts as his own the Profession of Faith of Campos. Campos is the Brazilian diocese where for many years the bishop, Antonio de Castro Mayer, refused to implement the liturgical decisions of Pope Paul VI, just as Archbishop Marcel Lefebvre (the founder of the Society of St. Pius X) had done. In June 1989 when Archbishop Lefebvre ordained 4 bishops, contrary to the explicit will of Pope John Paul II, then retired bishop Castro Mayer assisted at the ordination and was excommunicated along with Archbishop Lefebvre and the four ordinands [canon 1382, Ecclesia dei]. The Profession of Faith of
Campos clearly manifests the same spirit of self-judgment concerning Tradition, its extent, its interpretation and its application which brought about this schism. And while this text professes an admirable adherence to Tradition, it undercuts this profession by opposing the actual decisions of the only one capable of authentically interpreting Tradition. Sadly, based on his web site it seems evident that Malachi Martin, who on many occasions has defended the Church in public discourse, shares these positions.
Answered by Colin B. Donovan, STL"