Nazism is a phenomenon of early 20th century Europe. Even if that political movement drew on some older prejudices, it mixed them with new contemporary concerns, and the total aggregate dates specifically to that era. 19th-century North American manifest destiny was racist, and perhaps for certain people its space-colonization echoes today are, but to apply the label Nazi feels very ahistorical, dishonestly so. One might conclude that the author is being provocative for the sake of profitable online outrage.
Labels are getting thrown around too carelessly. I’m reminded of an HN post I once saw where anti-LGBT attitudes in the Muslim world were called literally fascist, even though they often predate fascism (again, a distinct political phenomenon that appeared at a particular point in time and space) by centuries.