Might a simulation/brain in a vat note evidence of being a simulation/brain in a vat leading it to reasonably state "I am a simulation/brain in a vat"?
The simulation/brain in a vat that made this statement would then exist in the real/external world and would not be a simulation/brain in a vat. Anymore.
Yes, correct.
And then, the question of whether it was a BIVIV must be addressed, and then once that is answered whether it is a BIVIVIV.
Which is all pointless, if you ask me.
The only reason the simulation hypothesis is even important is that it shows something about logical consistency -- since it is
logically impossible to determine if you are in the *base* frame -- the frame that is not some kind of a nested simulation -- then any arguments must be valid (not necessarily correct) in both the case of us being in a simulation and the case of us being in the base frame.
Case in point -- westprog had argued that if we are in a simulation, then we are not really conscious, because real consciousness cannot exist in a simulation. I don't think this is logically valid, given any definition of consciousness. If it were, then since we know we are really conscious, we could prove we were in the base frame. An inconsistency.
The logically valid formulation of the
idea westprog was getting at is to say that perhaps any simulations we make within this frame -- which would be a frame higher or lower than our own, depending on how you look at it -- wouldn't be able to support consciousness like our own frame can. This could be for any number of reasons, all of them reducing to the fundamental question of whether we can simulate
every feature of our own frame. That is a valid question. This also implies that if we are in a simulation, perhaps there is stuff one frame out that cannot be part of "our" simulation for the same kinds of reasons. And in that case, it would also be valid to say that we are not really conscious
in the same way that a being in that outer world might be conscious. But it is nonsense to say "if I am in a simulation, then I am not conscious."