I’m a 737 pilot. Reverse thrust is never calculated into landing distance. You use brakes and spoilers, reversers are a bonus. Airplanes are perfectly capable of landing with no thrust, in fact normally in an engine failure you don’t use the working reverser because of the potential of a loss of control from asymmetric reverse thrust.
Assuming worst case scenario, they lost hydraulic systems A and B due to an uncontained engine failure. In that case the landing gear can be lowered with a gravity release and the flaps can be lowered with an electric alternate motor. The right engine clearly is still working on touchdown, you can see the cowl shroud open as the reversers deploy in the video. The problem is that they touched down just short of the end of the runway, probably around 180 knots, with a totally clean plane. I don’t know how they got into that position, but it wasn’t only a bird strike.
I do this, then after the 5 years I feel like I need to start over from the beginning so I know the story. Then I stop just before the end again.