Where are these so called "underground groups within the ultra-Orthodox Jewish community that still practice polygamy." ? Your proofs for this bust consist of a vote of confidence, an oped and a website. I really hope you're not planning on becoming a trial lawyer any time soon.

How is this "bust" at all consistent with normative Jewish/halachic practice? It's not secret that it's Biblically permissible to  have multiple wives. But what has that got to do with what's happening in the Jewish world today?

As with most of your posts, this is poorly researched and makes bizarre claims that have little to no truth to them.