identical twins reared together vs apart, their IQs correlate more with their twin's than with the SES of the adoptive family.

high quality studies have found that the additive heritability of IQ is somewhere around 0.8-0.9, that's just totally incompatible with parental SES as the primary upstream cause. it's simply not debatable (and it wasn't debatable ten years ago either; this is hardly new knowledge)