I mean, you're right, but I don't think that's time well spent. This is a commit message, not a blog post. Writing concisely is hard and time consuming.
This was probably written in stream-of-consciousness fashion which strikes a nice balance between time invested and possible future usefulness (if any). I mean, the commit might be useful in the future, but there's also a reasonable chance that nobody except the reviewer of the PR is ever going to read that commit message. (If the OP hadn't blogged about it)