I believe in one of the expansions it was changed to be 0.5 tech and culture per pop instead of 0.7 tech and 0.5 culture.
But regardless, just building a meagre +2 campus and a library is worth
eight pops of science. A university is another eight. Fulfilling half of rationalism is worth 6 more. These are insane numbers.
Compared to a yield like production, where one pop can work a mine or lumber mill for 3-4

, but an IZ at
+8 (which is not difficult to achieve but much more effort than a +2 campus) is only worth 2 pops. The workshop and (powered) factory are only another 2, and there's no rationalism equivalent.
This makes science via any source but pops a huge bargain- one farm might provide food for 2 pops, but they also need 2 housing and an amenity, all so you can squeeze out 1 science and culture.