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Sniffnoy comments on Harry Potter and the Methods of Rationality discussion thread - Less Wrong
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As I understand it, their theory is that time travel is like postselection. Hence, to determine what would happen in the case of the grandfather paradox, they set up an equivalent postselection experiment. So if their theory is correct, the results of an actual grandfather paradox experiment would match the results of this simulated-via-postselection one.
In what sense is post-selection not time-travel? You've still got the state at time T determined by the state at T+1.
Because, if I'm reading this right, they literally manually postselected the results. They didn't come up with some way to get the physics to postselect it for you.