Trying to get through to your edumacated brain is futile, but for others, from V1.......
For the holy Spirit was promised to the successors of Peter not so that they might, by his revelation, make known some new doctrine, but that, by his assistance, they might religiously guard and faithfully expound the revelation or deposit of faith transmitted by the apostles...
I am sure you do not get the above, which is what I said in not so many words, which to you it is heretical, but to continue....
...for they knew very well that this see of St. Peter always remains unblemished by any error, in accordance with the divine promise of our Lord and Saviour to the prince of his disciples....This gift of truth and never-failing faith was therefore divinely conferred on Peter and his successors...we judge it absolutely necessary to affirm solemnly the prerogative which the only-begotten Son of God was pleased to attach to the supreme pastoral office... we teach and define as a divinely revealed dogma that when the Roman pontiff speaks ex cathedra....
V1 is not speaking in a general sense, rather they are speaking specifically about when the popes' faith will never fail. Namely, when he defines a doctrine ex cathedra. All you do is add whatever other additional infallibilies you think they forgot to mention.