Yes, by Børge Ousland in 96/97. But the whole concept of a first is sort of vague. Ousland used a kite, but he also went almost 1000km further. But I think it's widely accepted that he was the first to cross Antarctica unsupported and solo.
It would surprise me if it wasn't a Norwegian that did it, we seem to have some sort of obsession with the South Pole. Cecilie Skog in the article you linked to is, no surprise, also Norwegian.
If you ever want to walk in the tracks of people like Roald Amundsen you should check out Expedition Amundsen, a 100km ski trip by sled over three days at Hardangervidda. Hardangervidda is absolutely stunning, but also known for taking a toll on even the most seasoned polar explorers.