How long has the south pole been the south pole?
The article says, “All lived in the Antarctic Circle in what is now known as the Australian state of Victoria.” The bones weren’t found at the South Pole, but when they became bones they happened to be at the South Pole. :)
Under that model, continental drift / plate tectonics kicked in a mere 225 million years ago.
http://www.ucmp.berkeley.edu/geology/tectonics.html
There’s also True Polar Wander:
http://www.gps.caltech.edu/~jkirschvink/
And of course, Charles Hapgood’s crustal displacement (I won’t look for links, it’s probably depressing).