So it's not _totally_ broken. Completion still works if you can mentally remove the inline documentation every time you hit tab. But, I agree, that's not a real solution.
I suspect that the breaking change came from commit https://github.com/qpdf/qpdf/commit/29631cabd62f8a9790b5ea9c358fc6557fa17d2b because that was the last to touch /usr/share/bash-completion/completions/qpdf . It appears it was over-fixed.
