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Edit: Changes, that is, not a changelog.

I don't think that's a changelog. That is a collection of git commits, where the intended audience is primarily the developers of the work.

A changelog, by comparison, is meant for clients who use the work.

Yes, you're correct, it's not a changelog - rather, it is the changes.

Click "Files changed" for an actual diff. I am not sure what makes it v2.0.0, however.