The statements about books are not accurate. Ebook sales are still just a fraction of print sales in many genres - NPD data indicates ebooks are less than 20% of total unit sales for nonfiction, children, and young adult titles (self-published ebooks excluded). Total ebook unit sales were 162 million in 2017 from the 450 publishers tracked by NPD, down from 180 million units in 2016.
Source: Publishers Weekly, "Ebook sales fell 10% in 2017" https://www.publishersweekly.com/pw/by-topic/digital/content...