FWIW I completed my undergraduate degree in 2019, and I was required to take library science specifically. It was a half-semester course that taught students how to use the library.

I guess the value is it means the students have no excuse to not know how to find library resources, but I feel like most people in the class were generally familiar with the idea of a library and how to use it.

This sounds somewhat similar to other "college success" first year courses that are more about how to do research papers than anything else.

A proper introduction to Library Science is about how to run a library...

Good point. It would be an utter disappointment for me to take this class only to sit through explanations on how to find a book in a library (something I was able to do when I was 8).

It filled a general ed slot, I think. Or else I just wanted a super-easy class. It wasn't required.

And yes, it really was "how to use a card catalog". (Hey, I'm old. It really was cards.)