[joe_the_user]

If it's not Canada's land then can I come in there and break laws and say Canadian law doesn't apply because it's not Canada?

I don't know to what degree indigenous people have integrated their laws with Canada but it seems utterly obvious that any degree to which Canadian law and customs aren't applying is the degree to which indigenous laws and customs do apply so whatever else, "no, this doesn't mean a rando can do what they want".