Pizza look at 0:04 sec into the video. The pitch was reduced quite a lot. Descend rate increased. Probably to correct for a papi. Too late for that. Shouldn't be done.
Then probably some downdraft which resulted in hard landing. Not a WS. GA was of course the only right decision.
Flaps 3 and vls plus 10 gives you not only a better GA performance but also much better handling capabilities when fighting turbulence but I see you have no idea about it.