Looks like it’s an overall change on the Disqus format. Not just on the NRO site.
From what I gleaned from the Redstate comments, there seems to be a troll problem enabled by the fact that Disqus aggregates a commenter’s posts from all sites and allows stalkers to downvote everything the commenter ever wrote.
NRO has always had a huge contingent of leftist trolls that sometimes outnumber the conservative commenters.