Most rotating-vane type can't anyway, and the ones that do require very expensive materials. Thats why AFAIK
only Porsche has used VGTs on a production gasoline engine. I haven't heard of this type before, although it makes a lot of sense since its kind-of a variable version of the twin-scroll idea thats been around for a while now.
However, you still have the actuators or electronics mounted to the turbo, and still have to lubricate those moving parts as well as keeping stuff from building up on them or keeping them from changing clearances too much with temperature. That being said, this design does seem a bit more heat-resistant.
Even if you were to put one on a 7, how would you control it? To make the best use you'd need to integrate it into the ECU so that it was controlled off airflow and target boost levels. You'd probably also need to electronically control the wastegate to get the most out of the system and avoid boost oscillations.