It’s a correct assertion.
I wonder what fraction of the worlds population are descended from Abraham? A lot of generations have come and gone since Abraham died. Every generation you go back you have better odds.
No Jewish ancestors in my family going back 4 generations. Before that? God knows.
My understanding from a genealogy perspective (I’m a non-Jew so correct me if I’m wrong) is that most Jews have a blood link to the Israelites somewhere. Ashkenazi Jews are basically a mix of European and Semitic peoples, for example. Ethiopian Jews are mostly African but even they are thought to have a little connection to the “original” Jews via the Tribe of Dan.
However, anyone who converts is accepted as a Jew, and their genes then of course mix in with the rest of the Jews they live and worship among as they marry, have children, etc...
Is that at least somewhat correct?