Oops, it seems I put the Strip workflow in the Extract archive. Hope that didn’t freak anyone out. Thanks to Wally for pointing this out.
PS. I have tried the extractor on the latest version of Keynote, and it doesn’t work correctly, but I don’t really intend to update it, since the latest version does of Keynote does a reasonable job of printing a sheet of handouts with notes (certainly better than I was producing).