I love Borges so this is pretty fun to see.
As the dev said, in Borges' original story the texts are literally just random. What's fun about that is that theoretically every book every written is in this library, just buried under piles of illegible garbage. People search the library for sacred texts and moments of meaning. It's almost a religion of finding order in chaos. Very cool; I actually think a markov chain version, while more fun to interact with, misses that interpretation.