This only happens in photo mode. In LiveView, it uses rolling shutter for both start and end.
I don't know how to switch between the two modes yet.
I downloaded the original video and examinated it frame by frame; I don't think he just synchronized the LCD Shutter with the Sensor's readout (First Line reset = Ex. Shutter Opened, Last line readout = EX Shutter closed), because in this case the effect would be like when you are filming in video mode, in a complete dark room, an a flash flashes.
The only way to overcome the Rolling Shutter readout without using Global Shutter Circuits (on all the scentific literature I studied, the Global Shutter is always connected in a loss of DR performance), is to perform a Global Reset on all the lines, keep opened the external shutter for the exposure time selected, and then read the lines in the classic rolling way after the external shutter is closed.
I don't know how he did this, I'm still struggling to contact him, today I will try to do a series of phone calls to find him.
@a1ex:
I was thinking that since in silent picture mode you saw that blur effect (I assumed that it is a Global Reset readout, but without the camera's mirror shutter operating, so you see that effect) maybe it would be possible to do that when shooting RAW?
I don't remember how the RAW Video trick works; I recall that we just grab the data from the buffer or VRAM, but maybe in LiveView mode it is still impossible because since the Mirror Shutter is locked in the open positions, the camera does perform Rolling SHutter Readout to allow you see in the LCD.
I will find him today and ask, that's a promise.