This post states that "Captain James Cook was so impressed with one Haida fort off the west coast of Graham Island that he called it Hippah Island after the Maori forts he had seen in New Zealand."

This is incorrect and I challenge anyone to provide me with a source to credit this. It was actually Captain Dixon who was "so impressed" with the Hippah fort and he includes a sketch in his narrative. This is evidenced through the work of Albert Nilback:

In the narrative of Dixon's voyage (1787) a sketch is given of a Haida fortified house on Hippah Island, off the west coast of Queen Charlotte Islands. He says of it:
"The tribe who inhabit this hippah seem well defended from any sudden assault of
their enemies, for the ascent to it from the beach is steep and difficult of access, and
the other aides are well barricaded with pines and brushwood, notwithstauding
which they have been at infinite paius in raising additional fences of rails and boards,
so that I should think they can not fail to repel any tribe that should dare to attack
their fortification."

Niblack, Albert P
The coast Indians of southern Alaska and northern British Columbia (1890)