I haven't listened to the episode yet, but looking at the lineup on the home page... yes, those are some odd Bunuel picks. Robinson Crusoe and Death in the Garden are among his weakest, least distinctive films (and I find Diary of a Chambermaid to be a bit overrated as well, but it's certainly more "essential" Bunuel than those other two.
I'll have to listen to hear the reasons behind these choices. Disappointed that Exterminating Angel isn't in the works.