I have an AK (a VEPR II) and it is the easiest gun that I own to use in an ugly situation. It is extremely easy to take down, load and rack, clear jams (if that EVER happens to an AK), sight and fire. Very handy gun. Utterly reliable. Simple design. With no stock, and the inherent AK capabilities, they muct be training for encounters under 40 yards, because using the sights and getting an accurate shot will be nearly impossible with no stock and it's inherent inaccuracy. They must be training for urban fighting in close quarters.
One advantage that the grip they are using might have (holding the rifle and pistol grip so that the back of your hand and the ejection port are pointing straight up), is precisely that the magazine is turned sideways. An AK 30-round magazine is really long, and can get in the way if you are in a prone position firing, or if you have anything underneath the rifle that will hit the mag. That's why shorter 20 round AK mags are so popular. By turning the rifle and mag sideways, you can lay on the ground and be almost flat, hugging the ground. Or you can ride in the back seat of an attacking car, roll the window down, climb halfway out the window so that you are sitting on the window sill, face back towards the middle of the car, and spray the AK sideways without the mag hitting the roof of the car. You can get a flatter shot and don't have to hold the AK up as high over the roof of the car.