They do, for Enterprise customers only: https://docs.github.com/en/enterprise-cloud@latest/organizations/managing-git-access-to-your-organizations-repositories/

They do, for Enterprise customers only: https://docs.github.com/en/enterprise-cloud@latest/organizations/managing-git-access-to-your-organizations-repositories/about-ssh-certificate-authorities https://docs.github.com/en/enterprise-cloud@latest/organizat... They've rolled their host key one time, so there's little reason for them to use it on the host side.