Reposted later by someone else with more luck https://news.ycombinator.com/item?id=48686834

FTA: “Nature deviated from the normal practice of merely slapping the word RETRACTED across the digital version of the paper while still allowing scholars to read the text. Instead, the publisher posted a blank white page with the cryptic phrase, “This article has been withdrawn due to article violation.” Springer Nature is nevertheless still selling the empty PDF for $39.95.”

It’s not empty; it gives you the information that the article has been withdrawn /s