There's more than just that wording. That wording is just changed around. It goes from “directed primarily” to “primarily directed”. The government drafters have phrased it that way, but it's the same intent. The prohibition is really aimed at advertising that is targeting the child, so that carries the meaning.
The other point to make is that we're tightening up the language of the prohibition. Terms like “children's diets” are a bit vague for a prohibition to be able to enforce and interpret. It's just tightening those aspects up.