As the bug report you refer to does not exist, and the content list already uses the style properties for XenForo's discussion list (including font sizes), and I do not see any font-size issues on my test using the default style, and I do not see any font-size issues on your custom style, nor do I see discrepancies between the discussion list and the wiki-page list, it looks like this bug was posted in error (or at least "various" was an exaggeration), and is now closed.
If you would like to add more information to this report, don't hesitate to reply.