This bot sounds-out-words like a child to learn and identify them. It does not start out with much more than just syllable sounds. It is learning. It will be interesting to see how the system progresses.
However, I think this is the least impressive use of the $400,000 PR2 I have ever seen.
I would be more impressed if you could write down commands or directions and have the robot perform the task it recognized.
OCR has been around a long time, I expect more than this capability at this point.