I found an article from Radio New Zealand. Different wording but not other details on the 'mans' job though...

Man evacuated from Antarctica in NZ hospital

Antarctica New Zealand chief executive Lou Sanson says the US and New Zealand have a history of co-operation on the ice.
Mr Sanson says the nations have regularly helped each other out of difficult situations in Antarctica over the past 53 years.
The US asked New Zealand to perform the mission because all its Antarctic jets had returned to Seattle, he says.
The US embassy says it is deeply appreciative of New Zealand's efforts to bring the man from the base at this particular time.


[link to www.radionz.co.nz]

Edit to add this.....they say he is a scientist...

American Scientist Evacuated from Antarctica

A critically ill American scientist has been evacuated from minus 35-degree Celsius weather in Antarctica.

The patient, said to be a member of the U.S. Antarctic program working on the ice over the winter, was hospitalized in Christchurch immediately upon arrival

[link to english.ntdtv.com]