But with regard to trivia, such as The Sokal Hoax, it is always, always, always the job of the journalist to inform the reader. This is true for acronyms, units of measurement, coincidental circumstances and more.
If someone writes an article about the JFK assassination, they should be explaining JFK's initials, events surrounding the cuban missile crisis, the MLK assassination, Jack Ruby's mob ties, LBJ's rivalry, Bobby Kennedy's assassination, Ted Kennedy's car accident, the grains of the bullet used, what the unit of measurement known as the grain measures for a bullet, even what a knoll is.
The journalist should capture as much information as needed to convey all relevant information to tell a complete story. A bad journalist leave details out, and expects the reader to "just know everything."