Everything that happens in this video is legal. This is a rather quick motorcycle cruising down the autobahn in Germany---at about 186 mph--when an Audi RS6 station wagon quite correctly moves him into the middle lane and passes him---
German driving licenses are no joke.
They take months/years to pass, come in multiple stages, require certification in first aid (demonstration of competency in the test), and can easily be failed.
Lane discipline and signaling in Germany are no joke.
Have driven there and basically, you drive like you're piloting a small aircraft---time to distance, etc etc etc..
Enjoy. Oh, and "fear" because if there was oil or road debris...