I have not been following this, but to be accurate, which we should be, he should have said that some Catholics teach, without apparent censor, that those who wear the brown Scapular are guaranteed to not burn in Hell. And this issue pertains to the one raised here without resolution, as to the practical basis for for RC assurance of faithful doctrine. For which, at a minimum, the Nihil Obstat + Imprimatur used to be sought.
Catholics read, "Whoever Dies Piously Wearing This Scapular, Shall Not Suffer Eternal Flames" as being part of the Scapular Promises, and see a confirmation of which (with its implicit conditions) being given the Nihil Obstat and Imprimatur (Nihil Obstat: Joseph A. M. Quigley Censor Librorum Philadelphiae, die 1 Decembris, 1954. Imprimatur: + J. F. O'Hara, C.S.C. Archiepiscopus Philadelphienais Philadelphiae, 2 Decembris, 1954) , and consider this, at the least to not be contrary to official RC teaching.
The Nihil Obstat + Imprimatur here was provided under the 1917 Code of Canon Law which was in force until the 1983 Code of Canon Law, and which provides the criteria by which censors are to grant the nihil obstat ("nothing obstructs") which leads to the Imprimatur ("Let it be printed").
In every episcopal Curia, censors shall be appointed by office.
Examiners in undertaking their office, leaving off all consideration of persons, shall have before their eyes only the dogmas of the Church and the common Catholic doctrine that is contained in the general decrees of the Councils or constitutions of the Apostolic See or the prescriptions and the thinking of approved doctors. (1917 Code of Canon Law, 1863, 1,2)
The Nihil obstat and Imprimatur are a declaration that a book or pamphlet is considered to be free from doctrinal or moral error.” (The Catholic Encyclopedia Revised and Updated (Nashville: Thomas Nelson Publishers, 1987), p. 288)
“The Imprimatur and Nihil Obstat are official declarations that a work is free from doctrinal or moral error.” — http://www.usccb.org/beliefs-and-teachings/vocations/educators-and-youth-leaders/lesson-plans/upload/what-my-vocation-junior-high-unit-I.pdf
While giving the Imprimatur and Nihil Obstat to a document does not make it as requiring assent, neither can this approval be marginalized without damaging the claim that the church of Rome is the supreme faithful shepherd, for in that interest was the Imprimatur and Nihil Obstat given, which flowed from the Office of the Inquisition.
“To prevent the incursion of opinions that conflict with the church's teaching, the Sacred Congregation of the Holy Office, created in 1542, has the authority to ban books which it adjudges to be dangerous to the faith and morals of the faithful. The catalog of such books is called the ‘Index of Prohibited Books’ and Roman Catholics are prohibited from reading any book on the Index without permission.
In addition, the members of the church may not read or even sell any book that is dangerous to faith and morals, even if it is not on the Index. Wherever faith and morals are involved, the church claims the right of censorship over books. No Roman Catholic may publish a book dealing with doctrinal or moral matters without having it censored. - (Jaraslov Pelikan, “The Riddle of Roman Catholicism, “(1959).
As for the Dominican habit:
CHAPTER TWO Presenting the Scapular to Saint Simon Mary, “Whosoever dies clothed in this Habit shall not suffer the fires of hell.” "The small habit, known commonly as the “Brown Scapular,” is likewise clearly defined. It differs from the large habit only in size." - Sign of Her Heart, John Mathias Haffert PREFACE BY M o s t R e v . F u l t o n J. S h e e n; Nihil Obstat William A. Margerum , S.T.D. Censor Librorum Imprimatur * George W. Ahr, S.T.D. Bishop of Trenton pp. 12,16. http://johnhaffert.org/wp-content/uploads/2013/08/Sign%20of%20Her%20Heart.pdf
Well put, Counselor! That should clear up the issue. Well, it probably does for most.