I don't see what your issue is. Bit different if said captain covered the entire windshield, but if he was just blocking the sun in a particular area, than this has got to be better than damaging his eyesight and not being able to see anything anyway? Those Transparent visors are fine, but still not much chop if you are flying directly into the sun. And also a bit of context to this situation might be required. The above practice might be fine sitting in the flight levels, in CTA, but probably not on descent in the vicinity of an uncontrolled aerodrome. Common sense issue
