Perhaps it is because CMRI fervently adheres to the Suprema haec sacra letter published which in 1949 against Fr. Leonard Feeney. This letter teaches salvation for non-Catholics (this is non-members of the Body of Christ) via “implicit” baptism of desire, and invincible ignorance.
Also, CMRI twice published in their Quarterly Magazine an article entitled, “The Salvation of Those Outside the Church.” It was published in the Winter 1992 issue of The Reign of Mary, The CMRI’s publication.
Does someone have a link for said article? It would be a most delightful read!
The article is supposed to indicate that those who die as non-Catholics can be saved, which is a heretical rejection of Catholic dogma. This article is not the only one. CMRI has published other pamphlets defending Baptism of "Desire" and salvation for those outside the visible Church.