Ok. Looks like once you have set the publish flag, you must never unset it. Otherwise you'll never be able to remove the binaries again from the repositories. So in order to remove anything from the repo you need to disable build first (but let it still publish), then do the wipebinaries. Good to know. I wouldn't call this intuitive though ... JFYI, https://build.suse.de/package/meta/Proprietary:X11:Drivers/x11-video-nvidiaG02 has not been consistent with what is shown in the GUI on https://build.suse.de/repositories/Proprietary:X11:Drivers/x11-video-nvidiaG02 i.e. after reenabling publish in the GUI it was still shown as disabled in the meta file. This contributes to the confusion. :-( Meanwhile I've reenabled publish in all meta files and I was finally able to remove all outdated RPMs.