I ran across it on a thread here a while back. Some guy was going on about banking and the Rothschilds not being real Jews but Khazars.
Whenever you see the Rothschild’s name brought up, you know you’re dealing with a crackpot.
Anyone who converts is a “real Jew.” Abraham and Sarah were the first “converts.”
But the whole study is nonsense.
There are ample studies that show the Cohen line (Levitical priests) where ever they are -— Ashkenazi, Persian/Mizrahi, Sephardic, share the same paternal Y chromosome.
Similarly, plenty of studies that show close genetic relations with -— ick -— our arab neighbors.