The political use of Kanada is a reminder, used by people of First Nations background that much of the land is based in a relationship between various tribes of the First Nations and the "Crown" through the Peace and Friendship treaties. Since the Crown is represented by the Queen in the UK, and the treaties formed before "Canada" existed, there is a sense by many Indigenous people's that Canadian government is not the rightful sovereign of the associated lands.
The removal of the statue of John A. MacDonald is associated with this view, because John A. was the first Prime Minister of Canada, and a major driver of Confederation, which was the beginning of Canada as a country. John A. was also known for a range of policies, including the Indian Act, the Residential Schools program, the execution of Louis Riel and "The Numbered Treaties" which many believe to be part of a program of cultural genocide by Canada (not Kanada).
Thus using "Kanada" is a way of saying "the real Kanada, not the genocidal illegitimate Canada that did it's darndest to try and make us forget about the real history of this land."