"We said no. For us it was a matter of deep principle. For us it was fundamental to whether we maintained confidence in Labour. So we told Labour that. And staved off any action before the election."
Peters said when NZ First negotiated to be in a coalition government with Labour they agreed they were not going to abide by "politically correct policies".
He said Prime Minister Jacinda Ardern blindsided him by trying to push through a deal on Ihumātao in 2019 while he was overseas.
Peters said his party blocked the deal three times.
"We said no to Labour. Not once. Not twice. But three times," Peters said.
"If Labour governs after the election, by themselves, heaven forbid, or with the Greens, God help us all, then they will do a deal at Ihumātao.
"Nothing is more certain."
Peters told the crowd in a racially charged speech that he could protect New Zealand from "tokenistic, I'm-better-than-you woke people".
"One law for all has always been our mantra."
Fletcher Building purchased the land in 2014 for a planned housing development, but protesters from the Save Our Unique Landscape (SOUL) movement say it should be returned to Māori.
In July last year, Prime Minister Jacinda Ardern called for a halt to any building work while the Government and other parties tried to broker a solution.