I guess we have different definitions of robots. I'd say those are examples of industrial machinery much like a chemical reactor or a stamping machine, while I think of robots as something with joints performing more complex tasks. And those machines, if you watched the video, were all custom designed in house. They weren't bought, and thus would not be captured in the sales data.
From what I've seen it seems like everyone calls anything that even slightly moves by itself a robot.
That's a robot. It is a machine programmed to execute one or more tasks automatically. In case, you have not noticed a very good number of industrial robots that enhance automation in China are made by Foreign companies and automation of plants in China is not possible without their robots.
Foxconn doesn't build all their industrial robots - FANUC and many other robotics companies do.