This is a dense, academic work and I am not very familiar with The Canterbury Tales or the writings and life of Geoffrey Chaucer. What I did get from this is the many conscious connections to Greek and Roman myths. At the time, such myths were analyzed for commentary on morality -- rather like modern credos taken from the Marvel Cinematic Universe, or something. I learned of the Vatican Mythographers who did this analysis for the Catholic faithful.
There is much here about what Chaucer could have read as sources for his work, rather like similar things I have read tracing back the source content of Shakespeare.