Figured this out.
You have to get into the RotatedRect.points to see the vertices of the bounding box.
Assuming an origin at top, left, the point with the highest Y value - (or the rightmost point if two points have the same high Y value) - is designated vertex “0.” The angle from “vertex 0” to the last vertex of the bounding box (“vertex 3”) is what is reported in clockwise fashion. Thus, a negative angle means going counterclockwise (what we would normally think of as a positive angle). Further, because of the way it is set up, the angle will always be between -90 and 0.
This explanation helped me a lot. https://theailearner.com/tag/cv2-minarearect/