First, he had to very explicitly enable that keyboard (not easily done by accident, considering it's about 7 taps deep in Settings). After enabling, it is rather simple to activate that keyboard – hitting the globe icon on the keyboard will cycle through all enabled keyboards.

Second, the keyboard isn't ridiculous. It's actually quite powerful. He took a screenshot of the Chinese – Simplified (Handwriting) keyboard, which allows users to draw characters in the blank area. I hear it's an incredibly popular input method in China. Of course, the iPhone offers 6 other Chinese input methods, ranging from traditional keyboards to the drawing methods.