Deutsch argues that the future is fundamentally unpredictable, that for example expected utility considerations can't be applied to the future, because we are ignorant of the possible outcomes and intermediate steps leading to those outcomes, and the options that will be available; and there is no way to get around this. The very use of the concept of probability in this context, Deutsch says, is invalid.

This bit starts about 12 minutes in. It is complete nonsense - Deutsch does not have a clue about the subject matter he is talking about :-(