It doesn't say that the alien doesn't ask either.Well, it doesn't say in the OP the alien actually asks you which box you will open, if it would then Derren Brown could be the alien.
OP says: Omega selects a human being, sets down two boxes in front of them, and flies away
Nothing is said about the mechanism the alien uses to predict, in the OP or any other version of Newcomb's paradox. So we can imagine any (possible) mechanism is used to do so. Including polling, or reading body language. So yes, Derren Brown could be the alien.