Well, if I follow that article correctly, Lafitte's maternal grandmother was Jewish, therefore his mother would have been Jewish, and so would he.
Since by tradition, Jewish status is inherited and follows the maternal lineage, someone who is maternally descended from a Jew, even if totally unaware of their Jewish heritage, or even if a practitioner of another religion, is from a traditional Jewish legal perspective still a Jew. - Wikipedia article on Ashkenazi Jews
P.S.: Yes, I understand Lafitte was Sephardic. This distinction does not matter for the question at hand.