This case is a special though, as Bob CD is not a 100% complete package for doing CI/CD, it is one fundamental building piece for building your own CI/CD solution on top of.

So devops people would use Bob CD to build their in-house solution for it, and everyone would be using that, without actually using Bob CD directly.

Agreed. However, I still believe explaining acronyms is good practice.

I'm in software engineering and I'm aware of continuous integration but rarely use it and when I see CI its not the first thing that springs to mind. Any questions?

Every person who should be aware of CI/CD needs to learn it at some point.