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The author's point was that college IQ was dropping, and this explained the lack of rise of CS enrolemt. Simce CS is objectively harder, only a lower portion of college students can now do it.

That's their hypothesis. So their hypothesis isn't that CS student IQs are dropping.

Is your company actually selecting 20 kids at random, or selecting 20 from the best of the ones applying?

Are you also comparing this over a long timeframe? 112 in the 70's -> 100 now means less than 1 point every 3 years. You probably can't notice a difference that small year over year.

Of course, "the plural of anecdote is not 'data'," is the first thing I would say. I know someone who just went through the process to hire a half-dozen interns, some from top schools, who (frankly) would argue with you. There are a thousand possible reasons for this but I think the best course of action is to dispense with that, personal, line of reasoning.