One problem with the solution provided at the link is that it won’t work for WordPress VIP customers; since VIP provides the plugin as part of their plugins repo, it cannot be modified. I happen to be developing for a site that is hosted by WordPress VIP.
Also, the duplication of emails makes sense if you are an author on your blog as well as the owner of the Disqus account that is being used. However, if you have multiple authors on your site, the vast majority of people writing will not receive notifications as only the owner of the Disqus account receives those.