Somehow I completely missed the obvious:
property deleteMetadataNames : {"mdtest1", "mdtest2"} -- set your Meta Data Identifiers here
I should be good to go but want to ask again about the query question from my OP yesterday. Your comment was of course probing if I wished to permanently delete both the metadata itself and the custom labels (custom metadata) I made, in DT3. Indeed the answer remains yes to both, but I want to first examine all the files in my database in which I actually entered something in a those (single-line text custom metadata) fields I’m planning to delete for good. My intent is to then select-all and replicate those files to a temporary Group that I will name the same as the metadata field (and meta-data) I’m going to vaporize for good. Can this be accomplished first somehow?
Thanks again for being so helpful explaining this to me @pete31! …and for the script!