After the first five games it was 2.5 - 2.5. Whatever happened to Ian after the first loss does not indicate the level of the play he is capable of, and does not even in the slightest predict what would happen in the rematch.
I understand that Magnus glory hunting fans are everywhere and they love to pretend that once he had someone beaten, he'll repeat the feat with certainty, but have some more sense than that. More than one world champion has won the crown not on his first attempt, including one of the all-time greats, Kasparov.