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...the article you reference, concerns the intelligentsia being outbred.

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No, it doesn't. It examines the statistical correlation between all IQ levels in a society and the number of children produced. It's standard knowledge in anthropology/sociology that female completed fertility (i.e. number of kids) is inversely proportional to IQ in modern societies - over the entire population range. It's been an area of concern as it's believed people will get dumber (on average) as result of this trend.

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This is evidenced by a steady increase in average IQ throughout the west over the last 50 years

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No, it's not. This is happening in spite of the negative correlation (which is considered fact).