Interpreting it generously, the author was more focused on the fact that the imaginary strawman he was referring to didn't read anything besides number one best

Interpreting it generously, the author was more focused on the fact that the imaginary strawman he was referring to didn't read anything besides number one bestselling thrillers. Emphasis on best-selling as much as on thrillers. This illustrates a lack of intellectual curiosity, because this person doesn't seek out challenging books, they just read what's popular and what they already know they'll like. Remember that the focus of the article is on curiosity, not just on acquiring new information.