This current version does, indeed, link to the actual threads. All of the thread titles are not H1 tags because that would mean so many H1 tags on the page, that they wouldn't even be given any more weight than normal. It would be like literally enclosing the entire page content in H1 tags. H1 tags (from an SEO perspective) are used when you want to emphasize / specify one or two of your keywords (or a single phrase) on the page.