And as usual, wiliki can't actually refute the points.   Also, I've posted numerous studies discrediting your 60 year old study on a small sample group.   Here's the biggest point:

The study is a high intensity family intervention program and not just preschool for needy kids.  As one of the conditions to participate in the study, there needed to be a parent at home.  And the study also include home visits.   Those factors may have played a bigger role in the "success" of the experience more than the preschool experience.