That is a 3-day tracking poll, and only one of the three days is after Iowa. We will have to wait for Friday for all three days to be after Iowa. And even that poll with one day after Iowa shows Cruz gaining 2 points and Rubio gaining 4 points while Trump is static.
I mean, Huckabee and Santorum won Iowa, and they got 11% and 9% in New Hampshire respectively after their Iowa wins. That is where Cruz is headed.