Correct, it is a Disqus option that NRO recently implemented.
But the page you link to isn’t NRO, it’s Disqus help page explaining the change in how voting works. That appears to be a Disqus change, not a NRO change in options choices.
And when I looked at the moderation board options, it didn’t seem to offer a show/hide votes option.
So I’m not sure that NRO is the source of the change. While the Redstate post is older, it does indicate some of the troll problems that have cropped up from using Disqus.