Didn't read the article, but ...
1) "intelligence" as a thing does not exist. There are something like 6-10 different types of intelligence (different researchers disagree) and they many don't even correlate with each other. In other words, if you're "math smart" it does not necessarily mean you are "language smart" or "musically smart", so there is no (plain and simple) "smart".
2) Almost everything about humans is a combination of genetics and environment (nature and nurture), so even if there was a "general intelligence" it wouldn't be true to say "Intelligence is genetic". All you can say is "Each particular type of intelligence has both genetic and environmental components, and we now know that at least 10% of whatever type of intelligence they were studying is genetic"
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