I read an article recently that seemed dated. In other words, my first impression was that it was written eight, maybe ten years ago. However, on further reading, I found it was published on December 7, 2015.
My first impression came from two things:
1) The lack of specifics pertaining to self-publishing.
2) The snobbery aimed at those who self-publish.
In the early days of self-publishing, authors used a collection of names to call themselves: self-published authors, freelancers, independent authors, independent publishers, non-traditional authors and indies (shorted from the independent adjective). Some simply called themselves authors and left it at that.
All these tags are still used, but many authors have settled on one and used it to brand their work. Authors can use whichever they want to describe the method they use to get their stories into the hands of readers. They all mean the same thing.