I have this button (I think it's coming from this very forum, maybe even posted by you @Leo).
I've just tested it (in Opus 13.10.4), and it's working.
First test gave me a progress popup in status bar that took a few seconds telling it was trying to delete one of the files that it had just moved up, but it ended up closing it.
Subsequent tries : popup hidden in status bar flashes, but all goes well.
Most likely something has the directory locked the first time the delete is tried. Since QUIET is specified, you won't see an error message.
That might happen if e.g. a background thread (or another process) is still extracting information from one of the files in the folder when the delete happens.
No Dear @lxp That Filter was not enable, Now I have tried out with turned it ON and OFF But No Effect with the Buttons work. Nothing has been changed with turned it ON and OFF the Delete Filter. By the way this is Delete filter code on my PC