Region: Middle Earth
Ah yes, I see that I skipped over that post inadvertently. But yes, indeed, that is a very attractive interpretation of the situation, for me. Especially as it somewhat aligns with my amateur understanding of the original Celtic concept of their Otherworld -- a sort of parallel world to ours that can "phase" in and out of alignment with our own, seemingly at random, though also in conjunction with specific times. It just seems "right" for such a place.
Thanks for linking that youtube channel. Seems like a pretty interesting place, with all sorts of other fictional worlds explored, as well.