IQ positively correlates with income, educational attainment, age of death and socioeconomic status, and negatively with criminality, STI infection rates and likelihood of having a child out of wedlock so bunk it is not.
Regarding IQ and the brain there are positive relations between brain volume, white matter volume and IQ and between hippocampal volume and verbal IQ so
People are just realizing what's been true all along: IQ is a bunk measurement that points to nothing of note in the brain.