Can you provide a link to the claim? Interesting if true.
>Early twin studies of adult individuals have found a heritability of IQ between 57% and 73%,[6] with some recent studies showing heritability for IQ as high as 80%.[7] IQ goes from being weakly correlated with genetics for children, to being strongly correlated with genetics for late teens and adults. The heritability of IQ increases with the child's age and reaches a plateau at 18–20 years old, continuing at that level well into adulthood. However, poor prenatal environment, malnutrition and disease are known to have lifelong deleterious effects.[8][9][10]
yeah, animal breeding and crop selection work, but it couldn't possibly work on humans
You are right that the field of genetics is of course applicable to humans, with a lot more muddiness when it comes to the ethics - not the point.
The term "eugenics" describes a certain philosophy/set of ethics which directly grew out of racist narratives at worst and some very loose interpretations of the scientific methods two hundred years ago at best. Furthermore it can argued that the "field" of eugenics never really attempted to shed this, even as of today. Thus, calling eugenics pseudo-scientific is considered fair game. At least that's my understanding.