Earlier quoted context omitted.
IQ is a deeply questionable metric to start with (I have yet to see good evidence IQ tests measure anything more than "how good at IQ tests you are", and as a child I obsessed over them and got very good at them by learning how to approach them, which means it very much isn't measuring something innate), tests are often (and in the case of the historic ones actually cited in the "evidence", all) culturally biased, an…
Lots of research has been done controlling for income, adoption studies, and such, showing your words to be completely untrue.
Seriously who cares about a couple of IQ points?