It is funny and slightly dissonant that Roald Amundsen, the greatest polar explorer of all (forgive me Fridtjof) is mentioned in a subordinate clause as "The Belgica’s first mate, a fellow Norwegian named Roald Amundsen".
I too noticed that the author didn’t connect the first man at the South Pole with Amundsen
Yeah I also thought that was weird. This article is adapted from a book, so maybe his accomplishments are noted in an earlier, more detailed description of the expedition