None of the images in this book was drawn by a "real" human being. They were all "drawn" by computer programs that rely on "artificial intelligence" to decide what to draw. In response to a text prompt, they may "look" at hundreds of thousands of images to determine the content they should draw and the style they should draw it in.
The results are not only amazing (and occasionally hilarious) but also illustrate how art styles have changed over time and the limitlessness of human creativity.