This is true, but it also sucks if we assume "part of a career path". That means there's virtually no teaching-focus career paths in the UC system which is terrible for basically everyone. (Students as well as other faculty.)
In reality, there's spots where it very well could be a career path but it's incredibly difficult to make it work in CS. (And in many many other fields too!)
Yeah, this is largely true. Teaching-focused career paths in California Higher-Ed would be at Cal State or the Community Colleges. UC is about research, and expects all faculty to focus on research, although there are some continuing lecturer positions here and there.
In reality, there's spots where it very well could be a career path but it's incredibly difficult to make it work in CS. (And in many many other fields too!)