As for the reason there's a writing for games forum, the original idea (ten years ago? eleven?) was to promote higher quality stories in games - it was about the content of game stories, not anything special about the techniques used to create them. Also because that same reputation of game writing being crap would have subjected game writers to some prejudice at an average writing forum. The point seems irrelevant currently, though - neither here nor the big writing forums around the web have had much discussion of game writing in the past 3 years or so. If game writers are talking to each other somewhere other than privately within game teams, I haven't stumbled over it.
If you can't define the purpose for the forum or what discussion of game writing is, then clearly we have an issue. The topics in that list were created through suggestions from people here and are supposed to provide inspiration. If they don't then we need a better list, so rather than pick it apart we need to improve on it. An article that involves game writing might involve describing how it's done on a professional basis, the formatting of documents, software specific to story-telling, etc. People always want to know how you go from point A (start) to point B (finish).
For me, and I didn't put this up, I could see a lot of game writing articles as inspirational rather than "how to". This might involve creating articles that present various fictional scenarios you might commonly see in games. They might provide sample data that could be useful for writers. I'm not a writer but I'm sure ideas on how to name things, types of currency, items/equipment to a particular era, mythical equipment, historical perspectives (using historical references to drive games.. history is filled with a lot of mythology that could inspire people), etc. might be germane to the section. The ultimate goal is to get those creative juices flowing and get people contributing articles that would be useful for writing.