I have seen Dishka (50 cal) “technicals” and a few others and they are totally useless except for pumping large numbers of rounds downrange and “praying” you hit someone.
The first and second rounds might go close to where you are aiming, but then the vehicle starts to tilt back. That slight deviation sends the rounds way into the sky and well over the heads of the people you are aiming at. However, they are usually as untrained as the technical crew and they bury themselves into the ground.
US troops normally understand this, and return fire in an aimed and expeditious manner at the “technical”. This is why technicals are not used that much against US troops. At least not more than once by that particular crew.
I wouldn’t know from experience, but it seems like that guy’s in a rather exposed position where he is. Probably the same for the driver.