I want to downvote you but I'll reply instead: I've noticed this sort of response on HN more lately, where someone is criticized for the way they did a thing, or their approach in solving a problem, but the criticism is completely unhelpful.

patio11 clearly said in his blog post that CSS wasn't his bailiwick. Instead of simply saying, "You did it wrong!", you might say:

Here's a link to some popular CSS image replacement techniques: http://css-tricks.com/css-image-replacement/

It's also worth pointing out that, in that article, patio11's text-indent hack is cited as probably the most-commonly-used method.