Our automated repository checks [1] have detected that the repository registered as 'flussence' is missing a repository name in profiles/repo_name file. This is going to cause issues with various Package Managers and even may render the repository unusable to our users. Please create the profiles/repo_name file, and type the repository name inside. It needs to be equal to the name on the list ('flussence'). If you would like to use another name, please let us know. However, please note that our tools provide no meaningful way of informing users that a repository has been renamed -- therefore it is no different from removing and re-adding the repository with a new name. Please fix the issue ASAP. It prevents our tools from working on the repository, and mirroring it. We reserve the right to remove it if we do not receive any reply within 2 weeks. [1]:https://wiki.gentoo.org/wiki/Project:Repository_mirror_and_CI
Found the problem, it should be fixed now. I'd renamed the default branch and it looks like repo.or.cz didn't mirror that change. Gave the settings a kick and it clones successfully for me.
QA checker is happy once more. Marking fixed.