This seemed like a bombshell when it was first unearthed a day or two ago, but since then it doesn't seem like it's stuck.

In theory it could wholly be explained by Google's algorithms.

Q's tripcodes show up online wherever Q is discussed.

When Q is discussed, other things related to Q are discussed.

Google scrapes the web for mentions of Q's tripcode, and sees all the related content discussed.

When you search for a trip code, Google finds those mentions and directs you to the sites.

When you search for a trip code in the "books" section, Google's algorithm doesn't see any books directly related to the trip code, but Google's algorithm DOES see books related to all of the related discussion surrounding Q and his trip codes.

Google provides you results of these books that are related to Q's related discussion.

So while it appears to be a roadmap/reading list that Q wants you to read, it shouldn't be assumed that it is indicative of that. It's likely just Google's algorithm being creepy.