Except that, actually, the content is the same. Cloaking would be if Massive traffic drop from Google searches after migrating from myBB - #4 by smaffulli showed your response as “Upon diving into this issue” to users and “Upon googling more info on this issue” to Googlebot (the latter, of course, is keyword stuffing).
What discourse does is a case of this paragraph from “Hidden Text and Links”:
However, not all hidden text is considered deceptive. For example, if your site includes technologies that search engines have difficulty accessing, like JavaScript, images, or Flash files, using descriptive text for these items can improve the accessibility of your site. Remember that many human visitors using screen readers, mobile browsers, browsers without plug-ins, and slow connections will not be able to view that content either and will benefit from the descriptive text as well.