I found this at the bottom of the article posted by Guy:

Clarification: This story was updated on 28 November and added to the text that the Royal New Zealand Air Force had landed a 757 in Antartica. This was the first scheduled 7575 commercial passenger landing in Antartica.

So while it was the first 757 passenger service, it was not the first flight of a 757 to Antarctica.

Because the New Zealand Air Force had flown their 757 to Antarctica, I have, on several occasions, flown the Captain Sim 757 (NZAF livery) there.

Note: I have the Antarctica X scenery, which is a great addon for FSX if you want to do some flying in Antarctica. ;)