The link given elsewhere here about the multi-layered aspect of the stories from 1, 2 and RMI gives it a bit more depth. Obviously if you take it on the surface level only it's low effort.
that's a nice fan theory which does involve some very real elements from the game (the meta narrative, the genre awareness, the nearly constant fourth wall breaking, the multiple layers, the ambiguity) but speculates a lot and veers towards some wild hypothesis ("Stan is LeChuck" makes no sense however you put it).
I do appreciate the multi layered aspect, and it's the number one element which keeps me coming back to MI games, and I especially appreciated the way in which RMI felt like a fading dream, with stuff being ever more "slightly off" than before.
But if this is indeed the intended "meaning" of the whole thing, the authors didn't do a great job at it. We get only bits and pieces of this purported hidden "reality", and on the other side we have a couple of very easy to read narrative levels where The Secret is clearly a MacGuffin (a trope the authors love: see the rewards for the three trials, and the treasure being literally called "Big whoop"), the absurdity and the anachronisms are the point, and once it's over the only thing they can say is... the game is over, now turn this off and go do something more interesting, which is a nice joke and sufficiently meta. The issue is that it's ok the first time, but after the third time it's an overused trope