I thought their comparison of the PhD program lists to the Bachelors degree list was particularly interesting. As they point out, there is a wider range of source institutions on the Bachelors list, and generally the top 15 PhD programs had produced over 50% of professors, but it was under 25% for the top 15 Bachelors institutions.
This is pretty solid confirmation of a common observation that if you are interested in a career track where you will need a graduate or professional degree, you don’t necessarily need to go to a college that is among the “best” in that field (which is usually evaluated in terms of graduate programs and/or research). That is because many generally very good colleges are “good enough” in that area to place their outstanding students in the top graduate and professional schools.
So, in this case, of course it is fine to go to MIT, CMU, Berkeley, Stanford, Illinois, or so on for college, but apparently it can also be fine to go to, say, Yale. Indeed, Yale tied with Illinois on the Bachelors list, even though Illinois was fifth on the PhD list and Yale was not on it at all. Presumably this means Yale College CS grads are going on to do their PhDs at places like Illinois (or equivalent).
There are many roads to Dublin . . . .