Great vids and excellent examples of military/coastguard deck landings/winching, even if they are at the extreme end of the scale. By contrast a commercial deck operation in the North Sea is considered to be 'unstable' if pitch or roll exceeds one degree of movement and pilots are limited to aa maximum of four degrees of movement.
Notice how the pilots never try and match the pitch and roll movements of the decks. This can be done (in lower sea states with larger vessels) but would be a non starter in these conditions.
You can almost feel the disrupted air curling round the structure and well done for waiting for that that sweet spot!!
I would have been terrified to have to make that landing
