This article talks about how you cannot roll back things in Git in one paragraph, then about how your reputation is at stake and then immediately into what to do after you've fixed the problem of having committed a secret. I think it should also talk about how to fix the problem, if it targets an audience which might not know how Git works. Otherwise a novice is walking away from it having learnt that Git is irreversible but you can also still somehow fix an issue of having committed secrets to it. I know I'd be confused if I didn't already know what to do.