In the earlier video, the Chinese guy explained that upon entering 3D mode (Idle-1 switch), the controls are automatically reversed for inverted flight. This is the Beginner's Mode.
To switch to Expert / Advanced Mode, press the "Down" button (at the right of the LCD display). The flyer has to reverse the controls himself just like how he'd fly a real inverted 3D helicopter.
Jump to 1:20 of the video.