It appears to me that the loss of left aileron control occurred quite early in the video as viewed from the cabin. Compare the aileron in the first few seconds vs around 20 seconds. At the 20 second point it appears to me that the aileron is full deflection up.
Measuring distance against time, a rough estimate of speed downwind is in the region of 180 knots. I am thinking it was the intention of the crew to make a quick low level circuit for landing, but the fire in the nacelle progressed quicker and more fiercely than the pilots or the onboard engineers thought would occur.
On base the loss of aileron and the loss of power from the left engine combined to make the aircraft no longer flyable.
Indeed in the last 30 seconds, there was a report from the author of the video that the left engine should be shutdown.