www.airbusdriver.net/airbus_crosswind.htm has a few different unofficial viewpoints of how to achieve crosswind landings -- to many to quote, alas, and I wouldn't know which to select, some featuring rudder and some not so much.
Watching the video, I can see the nose weaving about on the approach, not sure how stable that was in the first place. The bounce probably contributed to the swerve, because the undercarriage would have provided directional stability had it remained in contact with the ground. Is the FBW rudder attenuation different on the ground than in the air, and could the automation have been in the wrong mode?