#OpenBSD is currently in the small post-beta/pre-release period, which my #swupdate utility has specific support for. That said, it appears this support was only included in the `swupdate -d` (download) and `swupdate -i` (install) options in the 0.7.1 release, not the `swupdate -l` (list) option.
So, I'll add an issue for that and fix in the next release.