[ig1]

It's touched upon in the article, but in reality they're probably not third cousins.

23andme gives relationship estimates for people based on percentage of dna shared, these estimates are based general population data. However they're not accurate for endogamous population like Ashkenazi Jews.

Any two Ashkenazi Jews who get married are likely to show up as cousins to each other, simply because there's so much shared DNA within that community. This isn't an exceptional case, but rather the norm for such populations.