Aldarc
Legend
Edit: I appreciate your attempt to clarify matter.It seemed like quite a big distinction but maybe I can help you grasp it better with an example of said distinction...
DM NOTES: Hrothgar of the Howing winds is the leader of the Wolf Nomads
Playing to discover the DM's notes would be, through play, discovering said information perhaps by visiting the lands of the Wolf Nomads, or researching the lineage of the Wolf Nomad leaders or... well I think you get the picture.
However the minute I as a player... Usurp the leadership from Hrothgar of the Howling Winds, aid Hrothgar in also claiming the leadership of the Deer Clans, assassinate Hrothgar for his son to claim leadership or to destabilize the Wolf tribe so an invading army can wipe it out... or take any one of numerous actions through my character that changes/modifies or creates a difference in the world... I am no longer "playing to find out what's in the GM's notes".
It is this distinction that I believe @Bedrockgames is trying to make (please feel free to correct me if my take is incorrect). A descriptor of "Play to find out what's in the GM's notes" in no way takes into account the ability of players to change and/or create their own "notes" in accordance with the GM's, something that heavy prep style does not in and of itself preclude from happening... thus it is a mischaracterization of what actually happens in the playstyle. Is the distinction more clear now??
Sure, and the moment that you kill an orc in Room 1 of the dungeon through your own actions, the orc that previously existed in the GM's notes, no longer exists, but this would still largely describe "play to discover what's in the GM's notes" in terms of the general process of play. The difference between the usurpation of the Hrothgar's leadership and the orc is primarily a difference of scale rather than process. This is why the distinction seems a bit arbitrary, if not a somewhat meaningless one, as the ability to simply create "new notes" in the game is basically a truism of TTRPGs through PC actions, whether we are playing sandboxes, no myth story games, or adventure paths. And "discovering what's in the GM's notes" doesn't seem terribly different from "discovering what's in the GM's authored world," regardless of whether they exist in notated form or not.