While I didn't do a CS degree, from what I could tell of friends who were doing that, it was a course in mathematical logic and algorithms built with that logic, and analysis of problems in such a way that they could be explored and solved using the logic, with some modules demonstrating applications of that mathematical logic such as operating systems and compilers, which were helpful tools created out of the logic in order to facilitate further exploration of the same.

A big clue going in, I suppose, was that the CS degree entry requirements demanded applicants to have mathematics A-Level (i.e. spent, under the typical UK system, about a third of their age 16-17 full-time education exclusively on mathematics). It was in no way intended to be, and clearly was not, a degree teaching people how to be software engineers or how to program beyond being able to put the logic, in the chosen notation, on the screen.

This was back at around the turn of the millennium.