Yes, the "in the path of salvation" language is crucial and completely missed/ignored by the BoDers. It's consistent with the teaching of Pius IX on the matter, that they are on a trajectory towards salvation and will, if they stay on that path, be given the necessary grace and enlightenment in order to be saved. "In/on the path" means that they are on the way, but not there yet, that they have not arrived at their destination. So this language was used deliberately.
St. Augustine and other great theologians applied St. John 10:16 to this very issue, emphasizing that Our Lord
must bring the non-Catholics into the Church because they cannot be saved as they are.
And other sheep I have, that are not of this fold: them also I must bring, and they shall hear my voice, and there shall be one fold and one shepherd.
Notice how Our Lord speaks, indicating that it is
He Himself who
must bring these non-Catholics into the Church. The reason why the Church doesn't allow anyone to baptize himself with water is to teach us that we cannot merit the grace of joining the Church. We are to recognize that we are dependent on God to provide a minister for us. Even in cases of emergency, a person is not allowed to baptize himself; the Church would rather have a Jew or a Muslim be the one who baptizes, provided he have the right intention, than permit a man to baptize himself.
It is a DOGMA of the faith that no man can merit the initial grace of justification. The apostles of "implicit baptism of desire" do not understand any of this. They write as if it is a matter of sheer effort for a non-Catholic to join the Church. It is very difficult, they say, because observing the natural law is hard for fallen man, but some can do it, and if they do observe it, then they will somehow baptize themselves implicitly, and become invisible members of the Church. The very reason God does not allow any man to baptize himself with water is to prevent this Pelagian nonsense.