I agree with you that most traditional Catholics (including clergy) at least vocalize the error that non-Catholics can be saved. I don’t think they understand the ramifications entailed by such an erroneous belief.
It seems to me that it’s tantamount to heresy to believe that non-Catholics can be saved, but I think that those (traditional) Catholics who say such a thing, don’t actually believe that and if you were to press them on the position, most would be inclined to understand it in a way that I just described.
I don't know about that, Bishop Fellay for example articulated the salvation of a Hindu in Tibet. There is no understanding from Fellay that such a person needs to cease to practice their Hinduism.
Fellay needs to form a mental image of what a Hindu is. I'm boggled he doesn't see that a Hindu violates the 1st commandment, and that they are inexcusable.
Fellay needs to re-read Romans chapter 1, assuming, I dare say, he ever read it.
If he finally understood it to be someone who offers to idols, then maybe the light bulb would click on in his head, and he would come to realize that a process of conversion is absolutely necessary.
The Hindu, the Muslim, the Jew, the Pagan, needs to cease to be such things and engaging in their particular practices, and turn to the Catholic faith.