I agree, I tend not to call myself an engineer because I don't have a PE license and never took a PE exam (though at one point I almost took the PE exam for electrical engineering). However, I was using the terminology of the article.

On a side note, when people ask what my job is, I usually say "programmer" or "software developer". For some reason I just feel uncomfortable calling myself an "engineer", I think I find it is just a bit pretentious.