You don't mention it here, but I'm going to guess that you're talking about a git repo. That Stack Overflow answer is talking about a Mercurial repository, and Mercurial is the only one of the two systems that has the "strip" function.
For git, you'll need to remove the bad commit(s) locally, then force-push your revised branch(es). http://stackoverflow.com/a/1338744/5054717 discusses some of that approach, but be warned that you're probably going to break things for anybody else who uses the repo.
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