All the commands above restore the state of your work tree and index as they were before making the commit, but do not restore the state of the repository. If you look at it, the "removed" commit is not actually removed, it is simply not the one on the tip of the current branch.
I think that there are no means to remove a commit with porcelain commands. The only way is to remove it from the log and reflog and then to execute a git prune --expire -now.