Books like A Pirate's Guide to First Grade

I admit that I don't care for pirates, but I just couldn't figure out the audience for this one. Even if it weren't written in pirate-speak, it still seems like an odd introduction to school. The narrator claims it's his first day of school and describes how grueling and exhausting and difficult it is, but then we see him reading Treasure Island, which is an unlikely choice for a child just starting school, especially as its Lexile score is over 1000 and has an AR score of 8.3 worth 12 points. I'm not a huge fan of lexile points or AR points, but I still think it was a poor choice to not only depict a child struggling with a heavy workload on the first day of school, thus painting the first day of school in a negative light, but to then show him reading such a difficult book just seems sloppy.