[dorian-graph]

I feel like you may have missed a salient section in the blog post. Here's one sentence from that section:

> Once a commit cements itself in git’s history—that’s it. It’s impossible to amend a commit message buried deep in a repo’s log.

[erik_seaberg]

It’s rarely seen but possible to https://git-scm.com/docs/git-replace a commit and keep its SHA.