EzekielRaiden
Follower of the Way
Okay.Hypothesis: I am Australian. Correct (when I advance the hypothesis). False (when you advance the hypothesis).
Hypothesis: The screen in front of pemerton is visible, in the forward arc of vision. Correct (when I advance the hypothesis). False (when you advance the hypothesis).
Etc.
You are assuming that the language used to describe planar states of affairs doesn't have relativistic or reflexive terms like "I" or "forward". But that is not self-evident. Especially once we're talking about a fantasy setting.
EDIT: In case it's not obvious, there are quite respectable views that elements of language that are not regarded as relativistic/reflexive by speakers, nevertheless in fact have a type of relativistic/reflexive element.
Does any of this argument apply to things that aren't self-reflexive? Because all of your examples are already starting from an individual person's perceptions, and thus necessarily about an individual person's perceptions.
"You cannot travel via the Astral Plane between any Outer Planes, you must first return to the Prime Material and then travel outward again to the Outer Plane you wish to reach" is not reflexive in this way. "Every soul of a person who dies, unless trapped in some way, goes to the Outer Plane associated with their alignment" and "Some souls of people who die do not go to the afterlife appropriate to them, but are instead stuck in eternal limbo, genuinely unable to join the deity that matches who they were in life" are not reflexive in this way, and I don't see how both statements can be correct, and I certainly don't see how perception could affect the truth-value of any of these statements. (Planescape making it so metaphysics yield to sufficient density of belief is, naturally, a separate concern.)