"Don't call yourself an engineer (e.g. software engineer) if you got a CS degree."
In the US we mostly haven't done this, so you end up with all kinds of ridiculous job titles with engineer added on. This is probably exactly what will happen with the term developer, and we'll have to move on to using something else.
You can't call yourself a "professional engineer" unless you are one but if you have a CS degree you can actually become a "professional software engineer" if you go through the process, pass all the tests and meet all the requirements.