Yes, you are correct, I tried this on the way home but it's not consistent. It seems if one accelerates up to the red line it will stay there, for a short period before shifting up. If one accelerates hard, foot to the floor, it will shift immediately if not just before the red line. (It was actually quite painful to try this, it's not the car's natural driving 'style' if that makes sense!)
The handbook does state if one accelerates whilst in ranges 1-4 the range may automatically shift up, in accordance with the vehicle speed.