The interesting thing is that it was probably not designed as a general IQ test, but as a test specifically developed at great expense to test for aptitude at computer programming at a time where absolutely nobody could be expected to have prior interest (let alone experience) in that occupation.

This kind of thing was the normal way of hiring programmers for a while before computer science departments became common at universities.

I learned this from "The Psychology of Computer Programming", originally published 1971. A fascinating read, both as a glimpse at a professional environment completely unimaginable to people accustomed to have their own dev machine, and more so for realizing that a lot of what the author wrote about the problems occurring in that environment are still relevant today.