It's an accurate observation that (a) everyone who knows anything about US politics already knows, but (b) this is a very international community in which as much as 50% of the viewers of this thread might not be in the (a) group. So I'm not really sure why you think it's not a valid observation to post here. If you don't think this article is appropriate for HN, that's fine (and I'm with you on that). Once it is here and once you click through to read the comments, it's not really fair to ding someone for commenting on it IMO.
What 'debate' on HN do you expect about such an article?