Maybe they're following (non-Android) Google conventions?
In the sense that calling it a beta seems just to mean that users should expect that features may be added or radically altered without a great deal of notice, rather than that the quality of the code is lacking. The keyboard itself sounds like a good idea, I'm going to give it a try.
That said, given the article's willingness to repeat the 35 second PR froth, it'd be wrong to overlook that the same phrase was typed in less than 22 seconds on a standard multitouch keyboard in this video: http://www.youtube.com/watch?v=WVXyVzLjKag . The specific OS running the generic multitouch keyboard doesn't matter.