Lucia Santos died on May 31, 1949.
And Sister Maria Lucia of Jesus and the Immaculate Heart was born on May 31, 1949.
They are the same person. But that was the practice pre Vatican II, to announce the death of the person to the world and their birth as a professed religious.
Was that the pre-VII practice? I'm just guessing. Also, I can't read the docuмent, it's too small.