I figured it was because it was a surprising and more-or-less unsupported statement of fact (that turned out to be, according to the only authority anyone cited, false). When I read 'poor people are better long-term planners than rich people due to necessity' I kind of expect the writer to back it up. I would have considered downvoting if it wasn't already downvoted, and my preferences are much closer to socialist than libertarian.

I don't have an explanation for the parent getting upvoted beyond a 'planning is important' moral and some ideological wiggle room for being a quote, so I guess it could still be hypocrisy. Of course, as of the 2011 survey LW is 32% libertarian (compared to 26% socialist and 34% liberal), so if there is ideological bias it's of the 'vocal minority' kind.