From the screenshot it looks like that's what was happening. Update: I take it back. It looks like it's doing more than that. So there's a bug in this plugin. Even so, not relying omn disqus would have avoided this issue.

Exactly - I think the sweetspot here is 'disabling disqus via Ghostery should block disqus, but not anything else' - the author of the original article appears to be arguing against the use of Ghostery altogether as a result of being burned by choosing disqus in the first place.