But data is uploaded, if you opt-in to that. If you choose to allow it, the map that the Roomba generates is uploaded to the "cloud", where it's cleaned up and made available in the iRobot HOME app. This was explained in the very next paragraph. They simply cannot say "data is never uploaded" because it's not true, but they can say "images are never uploaded" because it is.

And I wouldn't quibble about the usage of "cloud". It's generally understood that if the data is sent to a server outside of the customer's control then that's the "cloud".