ng0, As was mentioned by Tobias, there was a small communication noise: [[https://lists.gnu.org/archive/html/directory-discuss/2017-07/msg00003.html]].
His original intention with that message was to discuss the potential "MediaWiki -> GuixSD" importer only in guix-devel. And also the inverse only in directory-discuss. However, as he said, he failed to make it clear in the first time.