In response to your second point, at a high level I believe the calculation device would exist inside _one_ universe but calculate another one... the idea that you could calculate your own universe and use that to predict future events does seem covered in paradoxes. For one, the universe you're predicting would (recursively) have to include the computer you're using to predict it.
... but that's different to what I've argued here. I'm not claiming the states are physical objects, but just the existing of the pattern, even if temporary or intangible, would feel real to the humans/actors inside it.
... but that's different to what I've argued here. I'm not claiming the states are physical objects, but just the existing of the pattern, even if temporary or intangible, would feel real to the humans/actors inside it.