I would add that the original title "Introducing RinohType the Python document processor", is way better than the one of the HN submission. It is not a "modern LaTeX", let alone a "LaTeX rewrite" (which is implied by the "in 6500 lines of Python").
RinohType should eventually be able to replace LaTeX though, so it is not that far-fetched either. Also, the first paragraph of the article should help temper that excitement.