The author is confusing the term "relational databases" with the implementations of relational database systems that he has encountered.
That's like looking at a bad Python program and saying, "Python sucks," or like saying, "I've never seen a car go more than 10 miles without breaking down; therefore cars are not reliable transportation."
You can store just about anything in a RDBMS pretty much any way you want. You're limited only by your own skill and imagination and the particular limitations of your vendor's implementation.
A better title would have been, "Here We Go Again: The Death of the Relational Database Prematurely Announced."
That's like looking at a bad Python program and saying, "Python sucks," or like saying, "I've never seen a car go more than 10 miles without breaking down; therefore cars are not reliable transportation."
You can store just about anything in a RDBMS pretty much any way you want. You're limited only by your own skill and imagination and the particular limitations of your vendor's implementation.
A better title would have been, "Here We Go Again: The Death of the Relational Database Prematurely Announced."