This description of play makes sense in itself - it makes me think of a certain sort of classic D&D play, and also of the sort of approach to play that a hardened Diplomacy player might adopt.I may be misunderstanding the term as it is being used here, but when I think of GM world style immersion, I generally think of groups who have very little interest in the GMs narration but rather are focused on exploring the setting and feeling like they are there as characters. There are definitely people who play in a way where the GM's narration is important and colorful, and supposed to pull you in, but where I've encountered immersion focused on world, players are pretty skeptical of GM narration as a tool and tend to want the GM to be as brief with descriptions as possible. The idea being the GM simply narratives outcomes, things around them etc, but always avoids something like narrative past decision points the players might make. I.E. "I walk into the room", "In the room you see x, y and z; what do you want to do?" I would say in these kinds of games, players are generally not looking for something that feels like Lord of the Rings as a book, but allows them explore Middle Earth as characters.
But it doesn't strike me as immersive at all.