MikeAqua:
What HP are calling for may very well be breach of the ToW, and therefore a breach of contract - I don't know.
I think it's reasonably safe to assume that it's in breach of the modern interpretation of the ToW.
However, I believe that HP are actually calling for the original text of Te Tiriti o Waitangi to be upheld.
Caveat: This is notwithstanding that the second article guarantees property rights to the Chiefs, and that these rights have, at various points in history, not been upheld. And that these breaches are rightly being recognised and redressed... But none of that (to my knowledge) is opposed by HP
The key premise of HP is that they are seeking the third article to also be upheld.
Article 3 reads as follows:
Hei wakaritenga mai hoki mo te wakaaetanga ki te Kawanatanga o te Kuini
Ka tiakina e te Kuini o Ingarani nga tangata Maori katoa o Nu Turani
Ka tukua ki a ratou nga tikanga katoa rita tahi ki ana mea ki nga tangata o Ingarani
Which was translated from this English draft:
In return for the cession of their Sovereignty to the Queen
the people of New Zealand shall be protected by the Queen of England,
and the rights and privileges of British Subjects shall be granted to them.
The treaty calls for all New Zealanders, both the settlers and Maori, to be granted equal rights and protections.
In fact, translations of Te Tititi into English by Maori in the early 1900's describe it as follows:
This too is an arrangement in return for the assent of Governorship of the Queen.
The Queen of England will protect all the native men of New Zealand
She yields to them all the rights, one and the same as her doings to the men of England
This, of course, is the reason for HP choosing their name - Governor Hobson's proclamation at the time of signing that, "We are now one people."