Nice addition although I think some of the info is a little thin in places to warrent a 10/10. One major point... You mention in the first paragraph that the first ascent was in 1955 by an American Expedition. This is wrong. They initially thought they had reached the summit however, due to cloudy weather, the pair had mistakenly climbed the highest summit of the ridge between the Rock Pinnacle and Istor-o-Nal (North). The Americans thought at the time that they had made a first ascent.
This is clearly mentioned, that the American Expedition did not gain the Main Summit in 1955. The main summit 7403m was first time scaled by Spainish Expedition, led by Anglada.