A bit late to this news, but I just tried it and it’s very, very interesting! It not only helping with renaming a variable, but also suggest fixing whitespaces. It’s possible to turn off it’s option in settings, but I guess I would stay with it. While I don’t really trust AIs, this tool was made as it should be - it just gives edit suggestions instead of trying to become something it does not need to be.
I saw that their AI assistant does similar thing i.e. suggest changes one by one which is definitely a good concept. This way it gives suggestions instead of generating code or returning copy-paste mess. I really liked on their video that you can add specific files to the context, so soon I may be interested in taking a look also at assistant.