This article isn’t about vertically-centered text but horizontally-centered text. You don’t expect the starting place of each line to change with vertically-centered text!

centered 'stuff' is not evil. Centered blocks of paragraphs are not as pleasing to look at and are harder to work around with the rest of your content elements making up the design. But he's talking about centering it from top to bottom: vertically centered. Which is not evil but would be a very easy thing for CSS to just do in all browsers. yet it can't seem to accomplpish it. Every 'rule' can be broken when done effectively. another expert will tell you that only a minority reads our paragraphs of text anyway. And another expert will tell you that the harder it is to read something the better the comprehension will be.

If clean lines really solved the worlds problems, we'd be in much better shape by now.