[Titus Quinctius Cincinnatus]

Rather odd that this phenomenon had a greater impact on a subset of Jews than other parts of humankind.

Not necessarily. IIRC, genetic change becomes more marked in a smaller interbreeeding population than in a larger one.

[Deut28]

So then you would expect to see very similar results from similar sized interbreeding populations?

There are plenty of such examples in the world. It would be quite interesting if this study compared comparable samples, but the results would likely lead to more questions than answers.