I guess garbage collection is pretty advanced in the syllabus.

This course is just a second course on compilers for people who had an introduction. And a great one at that.

A good modern, practical and decently optimizing compiler can do just fine without all the things you've mentioned, including vectorization.

Besides, most programming language implementations never go beyond the basic SSA toolkit.

So, if you include the readings (proper research papers) and the course project, I'd say this course earns the "advanced" in its name.