Hi Brian!
That link you posted is a very old and deprecated way of looking at the library. The view is pretty much duplicated in game using folder view. Simply click on any file in your personal art library to activate it. You can make multiple selections here and delete with a single command. When deleting, make sure you are selecting from "Recent Uploads". This is where all of your files actually "live". When you place them in a folder, that is only a pointer to the original file in "Recent Uploads". Deleting from a subfolder only deletes the pointer, not the file. Files are shown in upload order. Good luck! I organize my art library every month or so, to clean up the organization. Doing it on a regular schedule helps keep it from getting out of hand.
