This was a badly flown approach by someone who was treating the rudder pedals like he was on a bicycle.
Maybe, maybe not. I'd second previous comments about FBW and gust suppression etc..and I'm not sure we should assume the multiple rudder movements visible well prior to the flare are pilot commanded..FWIW from the FCOM on another FBW type:
"...A gust suppression function reduces the effects of lateral gusts and improves lateral ride quality through a combination of yaw and roll commands. Operation does not result in either rudder pedal or control wheel movement."
Of course that doesn't explain what did or didn't go on in the flare in this case.