They don't accept pushes of repositories in that format. The article says "none of the Git hosting providers appear to be supporting SHA-256", and while GH is

They don't accept pushes of repositories in that format. The article says "none of the Git hosting providers appear to be supporting SHA-256", and while GH is not mentioned by name (and I applaud them for indeed not strengthening this "git == github-the-brand" trap), I can't imagine GH was left out of scope when checking the major hosting providers.