I am getting a sense you are leery of certainty and absolute, independent of subject, truths. Wouldn't this also hold for assertions of possibility? If I look at the above you postulate that 'for all we know' and a scenario where 'this' is a simulation. You are stating that this is possible. I have often wondered if this isn't a leap. Isn't this an assertion of absoluteness. Perhaps it is not possible. How can you decide: it is possible: given your stance - note the physical metaphor - on certainty. Isn't a statement of what is possible also absolute and about the real world out there?