You are either saved or not. There is no “barely” that I am aware of. One is not “barely” pregnant, barley dead, or barely saved.
You is or you ain’t.
The church OBJECTIVELY teaches “no salvation outside the catholic church”.
People (theologians, etc.) SUBJECTIVELY SPECULATE on any salvation otherwise.
Mixing these 2 together is the start of dogmatic
spaghetti , and only leads to dilution of dogma and the overthrow of the Apostolic Faith.
Leave SUBJECTIVITY to God who is Perfect Justice and Mercy.
The Church teaches OBJECTIVELY, not subjectively. Witness, No one has ever been canonized a Saint outside the Catholic Church. Witness, the Church did not have requiem Masses for any unbaptised person. Witness, the Church offers no sacrament to an unbaptised person. Witness, the Church exercises no authority over an unbaptised person or any in a baptizing sect.
These are all based on OBJECTIVE dogma, not on subjective speculation.
The answer to the question is yes, the Catholic Church is the ONLY true Church, since ALL sects are in constant protest to one or more of Her Teachings that go back to the early Church which was Catholic. No sect exists because it protests the “Assumption” being declared a Dogma in 1950.
Now, IF the Catholic Church is the ONE true Church, by that very statement, ALL others must be UNTRUE since the statement says “ONE”.
Embracing “UNTRUE” does not lead to salvation.