At first glance (doing a few text finds and a really quick read through the paper after clicking through that intro page with the poop emoji at the top and disregarding Recommended Music for this Paper: Dr. Dre – High Powered (featuring RBX)) that paper seems too short to adequately explore the topic.
On the other hand these same guys (the CMU Database Group) are an amazing resource and their youtube channel offers some great stuff [1] that would allow a curious person to explore the topic in greater depth if they dug into the papers of everyone who gave presentations at CMU.
clickbait: How many of the world's leading software engineers who addressed CMU students and professors about their successful database products rely on mmap? The answer may surprise you.