Charles,
there is a clear difference between saying that the Pope can’t infallibly interpret a bible passage and that every utterance from a Pope or Catholic group associated to the Pope regarding scriptures is infallible.
if you follow your logic, it would mean that every concept that is mentioned in the bible, that the Pope and affiliated groups can infallibly make a statement on.
Catholics don’t claim this. It doesn’t make sense. You are defining Papal infallibility incorrectly.
It is not a matter of what i say, or you, but what the Catholic Church claims about Infallible Papal Authority.
If you want to argue with the Catholic Church about infallible Papal Authority then you have to accept their concept of it.
If you want to take this seriously then you have to read up and understand what is meant by infallible Papal authority. If you don’t do this then you are left with your own interpretation and there is no common ground in which to have a discussion.
If you only have your own definition of this then you simply end up argueing with yourself.
Good luck with that.