Boltzmann Brains don't fluctuate into existence, they get created when entropy is moderate enough to produce galaxies with people in them that develop tech for cloning.

Would it even make sense to use words? Maybe a visual/interactive medium like a game would make more sense.

On that note, what does somebody who was born blind perceive? Do they perceive blackness or is there no sense of sight at all?

Just as when the discussion is about AI, it is my sad belief that we as a species do not have a single concept of consciousness sufficient to even be tested for, merely a collection of vague ideas that at best refer to each other and at worst to nothing at all.