It's really not. It talks about that at the beginning, but also goes into the appeal and design of card and puzzle games, a few specific card-focused video game

It's really not. It talks about that at the beginning, but also goes into the appeal and design of card and puzzle games, a few specific card-focused video games, and then a significant segment on the history of playing cards themselves. The bit about 52! is less than a quarter of the whole.