Natasha, I'm guessing that the comment was made in relation to her also being asked about other dairy.
I know that milk is not considered important here in Aus, rather the calcium from dairy... at 18mo Liam was taking NO milk, but ate yogurt, custard, cheese etc & that was fine with my health nurse as his total dairy intake fitted the amount
The other reason why total milk volumes are recommended to be less is to try & increase water as milk doesn't hydrate as well & with hot summer & it documented over 70% of the australian population are are dehydrated getting children to drink water is important... from memory they should actually drink about 700ml- 900lm/day of water or very dilute juice & so high milk volume cuts back on that