He doesn’t use this Echo skill, but the HUE emulation (New Binding: Hue Emulator - Amazon Echo integration). You can see this because he says “schalte AN” to the rollershutter. This is some kind of workaround, because the HUE emulation doesn’t officially support rollershutters (“fahre hoch”, “fahre runter”).
How he did this exactly is mentioned here (also in german…):
http://onesmarthome.de/smart-home-openhab2-sprachsteuerung-konfiguration/