The tooltip used to say that the center is always the objects origin. However, in the case of text-boxes, it's actually the center of the text box. There might be valid use-cases to move the text box center to the object's center, but it seems like the same can be achieved with offsets. Also that would be a new feature that's out of scope of a bug report. Pull Request: https://projects.blender.org/blender/blender/pulls/131693