Non-programmers will likely not be poking around on Google's engineering blogs, and will pick up the Press Release that will have been pushed to the likes of CNN and the BBC.
This is the central "Official Google Blog", not an engineering blog. From the other articles on the blog (most of which are written by marketing and other non-engineering disciplines -- see the last lines), it's pretty clear that the intended audience is anyone who's interested in Google, not just programmers. I know lots of non-programmers who like to read these, especially since a lot of news sites link to and quote these articles.