It is initially a stable approach, with a bit of low level corrections going on, but none of the magnitude needed to overstress the MLG. The touchdown shock is extended over the wheel un-tilting, and the compression of the MLG shock. That looks to have been within the normal limits in the video. The landing loads assume symmetrical loading across the MLG, however the single gear impact has to be considered.
I would be suspecting corrosion fatigue of the attach section around the steering bearing. It doesn't appear to be the axles, it appears to be a failure of the structure around the vertical bearing.