These were in the 2020 version of the book (at least mostly the same, I haven't found the differences); Keith's ideas about the Planes have always been fascinating to explore. WotC trimmmed their chapters way down in like every book of the last 3 editions, so it's really awesome that through DM's Guild (and now D&D Beyond) people are able to get to know the conners of the Eberron Setting that don't make the cut for the core Khorvaire Great Houses Five Nations story.
I"m still hoping we'll get an 5E Sarlona or Xend'rik expansion from Keith, but if you're liking Exploring Eberron, I highly suggest checking out his other D&D 5E books on DM's Guilde – specifically, "Dread Metrol", "Chronicles of Eberron", and "Frontiers of Eberron: Quickstone". There's a few others but those are the 3 non-Wotch source books that Keith was involved with for 5E. He worked a bit with Ruty on "Morgrave Miscellany" but that book really doesn't represent Keith's version of Eberron (down to including the Mark of Death! I appreciate seeing how someone might create rules for the Mark of Death, but Keith didn't want this published anywhere in anything even tangential to official manuals because that creates a sense of a canon narrative around the lost Mark.).