There seems to be a misunderstanding and misspelling with the names in the article cited.
Fk.Gfr. Josef Neudorfer, born 30.06.1926, was lost with U 534 on 05.05.1945. His loss was confirmed by a report of the supernumeray engineer officer Holtfreder.
Masch.Ob.Gfr Wolfgang Naumann, born 19.12.1923, survived the loss of U 534 and was rescued. He lived in Northern Germany after the war.