Great sleuthing! I am the creator of CurateWP and just saw this thread. Although Nieman Lab is using CurateWP on the website, it’s not currently being used to create this page.
I saw within the code references to “wwr-” and through my own searching I could not find a related plugin. It could be a custom plugin they created for themselves.
Regardless, I appreciate the mention! Reading how valuable this kind of page is fuels ideas that I can bring into CurateWP. I’m currently working on a new major release that focuses on the new block editor.