[wyago]

Native language is an almost perfectly heritable trait, but that does not imply it is genetic.

(However, it is true that saying that genes contribute to intelligence isn't eugenics. Eugenics is a methodology where you attempt to selectively breed humankind by broader intent, rather than by emergent properties of human tendencies. A proposed trait to optimize is often intelligence, but similarly frequently it's attractiveness and things like that. Genetic influence on intelligence is simply a hypothesis whose testing would have consequences on the practice of eugenics.)

------- edit ------- I see your reply to the other comment. I think a quote from the article that makes your point far better is "[...] studies have consistently shown that genetic influence on individual differences in intelligence is substantial." I negligently assumed you were specifically talking about heritability.

[burkaman]

I can't say for sure, but I think at least in biological sciences, heritability specifically refers to genetics.

From wikipedia (https://en.wikipedia.org/wiki/Heritability): "Heritability is a statistic used in breeding and genetics works that estimates how much variation in a phenotypic trait in a population is due to genetic variation among individuals in that population."