Writing "kitty litter/zeolite clay" certainly was bad style — it left ambiguous what the relation between "kitty litter" and "zeolite clay" is, which invited the editor to assume that they were synonyms and to just pick one.

Remember, kids, if you receive a sentence that's ambiguous, you can't edit it to make it less ambiguous if you don't have an extrinsic reason to know what was meant. Blindly editing can only destroy information, not create it (also known as the autocorrect problem).