Stupid caption on that video, it stated "landed hard" which is BS. That was a nice, normal touchdown. If he had gotten the gear out sooner it would have locked and been a non event...other than whatever happened to the engine.
From my end it looked like they had time to lock but the front right one failed to lock..but I'm no pilot
I don't know if the Sea Fury has a hydraulic over center bar or not. If the engine was dead he may not have had pressure which would at a minimum likely extend the time required to get them down.He did fine in any event.