It’s self evident they have full access to the network requests as they are a MITM, and from the article you can see they are in fact logging at least the URLs

It’s self evident they have full access to the network requests as they are a MITM, and from the article you can see they are in fact logging at least the URLs being accessed, the IPs, and User-Agent for trillions of requests. And they are cavalier enough with the data to use it for writing a random “Black Friday Analytics” blog post that is only tangentially related to their core value proposition.