They are not.
Those studies have been debunked.
The only Palestinian Jews are these ones:
Palestinian Jews or
Jewish Palestinians were the
Jewish inhabitants of the
Palestine region(known in
Hebrew as
Eretz Yisrael, lit. '
Land of Israel') prior to
the establishment of the
State of Israel in 1948.
The common term used to refer to the Jewish communities of
Ottoman Syria during the 19th century
[1] and
British Palestine prior to the 1948 establishment of the State of Israel
[1] is
Yishuv(lit. 'settlement'). A distinction is drawn between the "New Yishuv", which was largely composed of and descended from Jewish immigrants who arrived in the
Levant during the
First Aliyah(1881–1903), and the "
Old Yishuv", which was the pre-existing Jewish community of Palestine prior to the consolidation of
Zionism and the First Aliyah.
In addition to applying to Jews who lived in Palestine during the
British Mandate era, the term
Palestinian Jews has been applied to the Jewish residents of
Southern Syria, corresponding to the southern part of the
Syria region under the
Ottoman Empire; there are also historical scholarly instances in which Jews residing in the
Palaestina Prima and
Palaestina Secundaprovinces (4th to 7th centuries CE) of the
Byzantine Empire in
Late Antiquity were referred to as
Palestinian Jews.[
citation needed]
After the establishment of the State of Israel in 1948, the Jews of Mandatory Palestine became
Israeli citizens, and the term
Palestinian Jews has largely fallen into disuse and is somewhat defunct, in favour of the modern term
Israeli Jews.
en.wikipedia.org
When the Muslims invaded in the 7th Century they did not find Arab Palestinians, they found the Indigenous Jews, as written in the Quran or one of the Hadith. The Children of Israel.
And during the second Muslim invasion, the Calif opened Jerusalem to the Jews, as it had been closed to them since the destruction of the second Temple.
Come up with any last century "study" which all of a sudden says that Arab Palestinians are descendants of Jews, and the Arabs own history calls those studies a lie.l