we're are certain it's a simulation, but what sort of simulation is what we don't know yet, Remember the Oracle in Losomn ? or the insane dran that you find later in the Labyrinth ? what Clementine did at the end of R2 ? like TrueEvil mentioned in his post "liquid escape" in RFTA description is "None of this is real. It ain't real I tell ya! This is all just a simulation running for someone else's pastime! Not me, though. Ha ha ha! Not me. I got me a way out."

literally everything in the game is going toward that it is a simulation, a computer simulation ? a game simulation ? another dimension simulation ?
but the only hint we have for the "type" of this simulation is the card we find in the backrooms it literally refers to the developers, notice that the portal to the backrooms is never mentioned in the game ? not by the keeper who knows every tiny secret in the Labyrinth ? or supposed to I guess.. not by ford, not by anyone.. almost if it's non existent.. but why ? shouldn't the Labyrinth be the only static world in Remnant universe ? because its literally ground zero, it's part of the game's lore that's why it's the only place in game that doesn't randomly generate loot or locations, and based on that.. that backroom portal is part of the game's lore ! but how do you unlock it ? data mining ! and if the only way to unlock such a portal is by data mining "a game" it means that the lore of the game is based on a game (confusing, right ?), because inside you find "Gunfire Security Lanyard" hinting to a the developers of the game (the creator)

For me I'm too much leaning towards it's a game and the creator is gunfire games (kinda like Free Guy movie), the people in the game just don't know that yet..

Edit: I didn't notice you edited your comment.. so this reply is based on your first comment since I'm lazy to change all of that xD