I can't explain how the RSS feed has been broken so long, but I truly appreciate you bringing it to our attention. You'll be happy to know that the feeds are once again operational. Thanks again; I wish I had known about that a lot sooner!
Things became disconnected around the time we moved over to Wordpress, and we just never checked the feeds - kind of silly when we think about it. We have a feed directly from our site that you can use too: https://techgage.com/feed/
We've been making a lot of changes to the site recently, such as SSL across the site, new forum software, server upgrades, backend stuff like OS upgrade, switching to PHP7, moving over to nginx from Apache. Millions of little things that can go wrong.