I know you're just quoting the standard line, but without "not hacker news!" postings, how do we, as a community, transmit a sense of what is and what isn't? Just let people guess why articles are killed - if they are? Thinking about it a minute, I'd rather have a loose rule along the lines of "not hacker news" comments should be relatively verbose in terms of what is wrong, rather than a simple, dismissive "not hacker news!".
I think the appearance of articles like this is a good indication that this sense of what's appropriate hasn't been transmitted (or at least my sense of it:-). This article is blatant politics/reddit bait, and is certainly not something that would be of more interest to hackers than to the general public.