I've had a hunch it's about the shrinking width of pages. The text-width is about 11-13 words (at a max-width of 728) and the author seems to have written around this.
Because it's so thin, anything longer than 12 words becomes a paragraph which "slows" the reader, so there are a lot of punchy short sentences. This style would look silly if it was written on a wider left-aligned blog.