The critique of the 'raised apart' twin study as 'they were not as far apart as you think' is not actually that strong given that the results replicate, they still exist when eliminate these populations, the effect size is way too large to be explained by some 'raised apart' twins living close together.
The better critique is that a lot of what you are actually measuring is maternal womb conditions, ie. placental sharing, which can have a massive impact. The jump from within-family twin study to interracial genetic IQ difference is also not a well-justified one.
The better critique is that a lot of what you are actually measuring is maternal womb conditions, ie. placental sharing, which can have a massive impact. The jump from within-family twin study to interracial genetic IQ difference is also not a well-justified one.