No, it's saying that if you use the same device to entertain yourself and to do homework, and you use it for entertainment 10x as often as you use it for homework, you'll get distracted then you're doing homework.
> It's like arguing that a student who likes reading Harry Potter, or Comic Books 2 hours a night is forming habits against the idea of using books for learning.
Books are separate objects, they are not a platform. It's saying that if you put a child's homework as a two page insert into a great comic book, the rest of the comic book will distract from the annoying, difficult insert.
The opposing theory is that the proximity of homework to comics will somehow make the homework fun. Homework is going to be hard and annoying no matter what you do, if it's not hard you're not learning anything from it.