It does indeed say the person who dies wearing it will not suffer hellfire.
However, it does not say wearing the scapular is what saves. That is just a simple literary fact.
your logic skills are a bit lacking. But it is very much a Roman trait to deny plain language. It does not say a person wearing this that believes x... it says a person wearing this. If the only condition is wearing the scapular then wearing the scapular is what saves. Period.
You can keep spinning it anyway you want...but the apparition disagrees with you.
This shall be a privilege for you and all Carmelites, that anyone dying in this habit shall not suffer eternal fire.
The Blessed Virgin assigned certain conditions which must be fulfilled:
1.Wear the Brown Scapular continuously.
2.Observe chastity according to ones state in life (married/single).
3.Recite daily the Little Office of the Blessed Virgin OR Observe the fasts of the Church together with abstaining from meat on Wednesdays and Saturdays OR With permission of a priest, say five decades of Our Ladys Most Holy Rosary OR With permission of a priest, substitute some other good work.
The literary sense is that it makes a statement.
And that statement says that the scapular saves people from eternal fire if they die wearing it.
However, it does not say wearing the scapular is what saves.
That is just a simple literary fact.