>"Aligned with race realists and monarchists (?)" Definitely not.
Definitely yes. Ever heard of Moldbug? The dude who claimed the rule of Leopold II (yes, that Leopold II) would be better than our current government?
I am not claiming that they are the same movement, but the Dark Enlightenment is closely related to the Rationalist movement. There is a great deal of cross-pollination.
The New York Times article is a great jumping-off point to read about this connection! It has several relevant links, including this one that explicitly discusses the monarchists: