Pilot here, I'm trying to avoid speculation, but, from what i was able to see in the video from the frame by frame, it appeared that it had lost several vital systems. First and foremost, gear was up, Flaps were not deployed, flaps change the overall shape of the wing, they create extra lift as well as drag to allow the plane fly slower while on approach to land (this is the simple layman's explanation), the spoilers had not deployed either, which lift up vertically on the top of the wings, this kills the lift generating airflow over the wing and additionally create drag and act as an airbrake. So with no flaps they would have to fly an approach at a significantly higher speed, with the landing gear failing to deploy their ability to slow down was entirely up to any aerodynamic braking and thrust reversers (Which were deployed.) Also that wall they hit at the end was a massive cement structure that was the base for a localizer (essentially a radio wave transmitter that gives glide path info to the aircraft and is displayed for the pilots to see when they are landing in bad weather and are unable to see the runway due to the clouds, fog or rain.)

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