i’m not really sure what IQ has to do with this. it was originally designed to measure people’s proficiency in school. it was not designed to be a general measure of intelligence. that was something that was co opted by eugenicists.

here’s a quote from Simon Bidet, the original creator of the IQ test, about his thoughts on the eugenicists using his test:

Finally, when Binet did become aware of the “foreign ideas being grafted on his instrument” he condemned those who with ‘brutal pessimism’ and ‘deplorable verdicts’ were promoting the concept of intelligence as a single, unitary construct.

you can read more about this stuff on his wikipedia page. (the quote is from wikipedia)

even to this day, there is quite a bit of doubt as to how accurately IQ measures “general intelligence”