Approximately 203 pages are somehow related to SEO. Let's be conservative and say that half of them are duplicate links to the same questions. Out of 339 questions that's a whopping 30% of questions on one very specific and specialised category.
My metrics may be flawed - Searching for "SEO" in the search only tags 60 questions, but a lot of the questions are not tagged SEO. Even 60/339 is 17% which is still a reasonably percentage.
Should the site be re-focussed as an all-things SEO repository?