Before going on ignorantly speculating about the validity of the post Vatican II sacraments, please consider these facts: Luther’s heresy was declared in 1521 and until today, the Catholic Church has not declared invalid the sacraments administered by most of the Protestant bishops. When the Church baptizes a convert from Protestantism, she uses a conditional formula, which means that in the time span of some five centuries, she still has not decided whether the Apostolic succession ceased in those heretical sects and the sacraments administrated in them are valid or not.
Only regarding the Anglican sect that separated from the Catholic Church in 1534 did the Catholic Church declare its orders invalid and null. However, more than 300 years passed before Pope Leo XIII in 1896 wrote his Encyclical Apostolicae curae clarifying this question regarding the Anglicans.
Thus, if the Holy Catholic Church, which is the source of all wisdom, took and is taking so long to declare orders and sacraments administrated by known heretics as invalid, this teaches us that heresy does not automatically bring about invalidity of orders and the sacraments, as many unwisely conclude.