Who are you implying did do this?
SSPXers (with apologies to St. Pius) maintain that the Church teaches heresies, the Catechism of the Catholic Church contains heresies, the GIRM is rife with heresies, Vatican II is full of heresies.
I have even been told that it is a heresy to call John Paul "the Great."
Fellay teaches the Mass is evil - that is a heresy because the Living Magisterium CANNOT apporve an evil rite/liturgy.
Fellay teaches the Jews are cursed. The Christian Church teaches they are NOT cursed. There are MANY other heresies his souls is bound by. All together, they weigh down his soul like an anchor and that anchor is dragging him down into Hell
I pray he, and other memmbers of the lefevbre cult, repent while there is still time