I know nothing about this specific person. But the American Republican party is on a bit of a hypocritical purity crusade. They claim that porn is bad. They are the ones getting all worked up about other peoples sexual life, because it somehow affects the sanctity of their marriage.
So this article is pointing out his hypocrisy. He is doing something wrong by his own standards, so what room does he have to try to make laws about his stupid beliefs when he doesn’t even follow them himself.
$6996.99 per year is $134.56 per week. If you get 5 books per week, that’s $26.91 per book. Given the picture includes a single book costing $19.95, that feels very reasonable. Maybe it’s 6 books a week, maybe some books are more expensive.
That’s a very consistent habit though.