I just realized that now that it's been a few minutes since I read the article, my take-away was actually "there is a lot of value in re-reading books", rather than "you should read some books literally 100 times". I'm not sure which was supposed to be the take-away, but I think the former makes more sense than the latter! So yeah, re-reading books you like 2-3 times is a great and enjoyable exercise.