English teacher (and ADHD-haver!) here!
This is definitely from a classroom, and it is to help students develop habits of good readers. It's also a we-see-what-you're-doing notice to the nonreaders who think they have us fooled. Getting students to stopo "fake reading" a whole thing in education. "Fake" reading literally means that... the students are pretending to read, or they are trying to comply but not really getting anything from their book.