Clip4
Touchdown! Greaser!
Every time I've flown into a controlled airport the controller has told me which taxiway turnoff they want me to exit on. If I'm being honest, I'd always been under the impression that I had to get clearance anywhere on a controlled field except the non-movement(ramp) areas. So cleared to land gives me the whole runway, then I need permission to turn off onto a taxiway, etc.
The AIM may say turn off on the first available taxiway but I don't think that's how pilots are being trained or how things are being done in practice. At least not in my, admittedly limited, experience.
That is because students are typically trained at a sleepy Delta. Not doubt the pilot in the video expected the tower to tell him what to do next. Absent that instruction, you turn off. This event was a Charlie, the tower controllers get busy, they expect you to know proper procedures and not to do unexpected things.