A position usually inhabited by those who are married to, have children by, or have loved ones who do not meet the guidelines of matrilinial descent.- Otherwise known as the Halacha which has been Jewish law for a milennia or two.
Maybe, but this guy is Israeli by-way-of Istanbul.
Rabbi Chelouche (head rabbi of Netayana) was in the paper recently saying, in the offical opinion of the Orthodox Rabbinate, Karaite are Jews and did not need to undergo even a token circumcision to be halakhically Jewish -— but were to be considered tinok shenishba (prisoner/kidnapped babies), at worst.
Pretty much got there because, even if not Jewish, the Karaite oaths taken (coupled with an existant circumcision) would be sufficient for a gentile to have converted, so certainly good enough for an arguably “half-Jew.”