I get the point he's trying to make, of course, but it seems like a stick to beat parents with (and particularly mothers, of course). There's no sense in saying you want all children to be in the same place when they start school. Apart from anything else, some are nearly a year younger than others in their cohort, so clearly they are not going to be in the same place.
My youngest daughter was born premature, has a significant hearing impairment and various other difficulties. She will soon be two, and while she's doing brilliantly, I doubt she'll be "school-ready" by the government's current definition when she is four.
Not sure what my point is exactly, it just seems like another absurd over-simplification on the theme of failing our children, state of the country, etc.