When I require an ns in the cider-repl in emacs using just a require with no :as for an alias, I am still able to access the symbols of the ns using only the last component of the ns’s name. See below.
I find this surprising as it changes how require work.
But I noticed that If I (require '[clojure.edn :as edn]), re-evaluating the (ns) form didn’t drop the old aliases. Perhaps you have some old state lying around? Consider re-checking from a fresh repl?
Since you are already inthe-divine-cheese-code.core namespace, anything that namespace has required/refer’d is already going to be in place (assuming you required that ns and then switched CIDER over to it).