The entire fucking ice wall bullshit is out of date.
We are talking the 1800's for Christs sake, NZ was barely even colonized then.
He made that when Antarctica was viewed as that, a wall of ice - since then it has been explored, circumnavigated and mapped, it has a set size, the ice wall theory is rubbish.
Quit holding onto straws that no longer explain what is proven to exist.