FYI. We updated the changelog post with more details about what actually changed (and what did not change): https://github.blog/changelog/2022-08-04-commit-comments-no-...

You can still add comments to an individual commit and view them from various pages. However, comments added this way will no longer surface in the timeline(s) of pull request(s) that happen to include the commit. This does not change anything about pull request review comments, including review comments added when reviewing a pull request commit-by-commit.