A 60 year old study on 123 students is not exactly relatable to today where people, preschools and society has vastly changed from the 1960.    The study would need to be duplicated with a bigger test and control group.   The studies done today show that preschool provides no long term benefits.     

I haven't lied about anything.   My opinion that the study you cite is not reliable when applied to today's kids and preschools is a perfectly valid one.