Actually the person is not entirely incorrect though he had probably miscomprehended in one way or another.
In Blu-ray Optical Disc Drive (ODD), there are actually two separate lenses for the 405 nm Blu-ray and 650 nm DVD laser diode. Incidentally discovered this after striping one apart for my self-made 480mW lasing apparatus which exceeded the IEC 60825-1 Class 4 standards at peak output power and strong enough to burn through multiple layers of polymer and wood. :sweatsm:
Got photos? Did you really use it to burn through stuff? You seem to be involved in many cool projects!