That must be frustrating. There are definitely some depths and nuance to the GNS model. For example, GNS Simulationist is not a simple category, and I found some of the things Edwards put there pretty counterintuitive until I read further. And while his arguments made sense, I thought he could have picked better names. The man had a gift for picking particular bad names (and not just on semantic grounds).What I find when I engage the GNS theory is that the users of that language explain something. I try to explain it back in my own words and they don't have any particular issues with my characterization at that time. Then later in the discussion as I'm trying to take what I learned and apply what I've learned, it always comes out that my understanding was wrong due to some additional nuance or some additional component of the theory that is yet unrevealed, etc. Every single time!
Reminds me of my aikido and tango learning, where a teacher will show me one way of doing a throw or dance figure, say I have to have such and such a posture, put my weight there, and then another—excellent—martial artist or teacher, will tell me to do something different or, more frustrating, give me some detail that would have made the earlier instruction so much more helpful!