To say we've moved on is an understatement.
Let's start with relevance. He was the herald of the Modern, and a rum challenge for any intellect. (although I would stress the importance of knowing the world he was working in)
Which is to say, for a student, he's definitely worth studying. Your articles about post-truth and such are fine. He was responding to the hyper-nationalism in the Germanic states of his time.
Using the classics to illustrate the present is a time honored tradition.
One of the problems I routinely run into, when discussing philosophical issues, is that I almost invariably can't get the discussion into the 20th Century. It's annoying.
So much has gone after, I am at a loss to know where even to begin. I like Rorty, but he was a reaction to Modern philosophy, so you need to know a little about what he was rebelling against.
https://plato.stanford.edu/entries/rorty/
He's the alpha, not the omega.
He's a key, not a lock.