I'm reading from the 16th century Dominican (scholastic) theologian Melchior Cano, who distinguishes also (as did Fr. Feeney) between justification and salvation, and he believes that a certain state of justification can be arrived at through natural exertion, whereas salvation requires supernatural faith (he doesn't discuss Baptism as much as faith).
De Lugo, as pointed out by XavierSem, listed 3 different opinions which all revolved around the different permutations of justification and salvation.
So Father Feeney did NOT invent that distinction.