To be charitable, you could call it misleading laziness. But the article was published long after all the papers were de-anonymized, so it seems perverse to explain that the submissions were originally anonymous instead of just giving the authors' names.
Furthermore, the journalist managed to write an entire article about a workshop without once naming it, giving a link, or even defining backpropagation.
Edit: I want to say that I understand it's hard to cover an area that you're not an expert in. But if the journalist had googled the title of the articles he was writing about, he would have found the authors' names. Instead he gave the reader the impression that the articles are still anonymous.