I’d say timelapse and hands added afterwards? Else he’d have really tired arms!!

Impossible to stay up this long sitting beside a camera and constantly keeping your arm up doing slowmotion movements.
You cant possibly keep that up for longer than 5 minutes.

Basicaly recreating that light is quite simple, just get a dimmable light source and adjust the light.
The Hand movements clearly have cuts (not constantly filmed)
he just adjusted the light in the room he was filming his hands.

I wonder if he estimated his movements in a bluebox
or if he did it live and simply played the film while moving his hands – recording the screen and the hands at the same time.