Rarely does one see a better example affirming the old saying, "I'd rather be lucky than good…"
I'll give the skipper the benefit of the doubt, and concede he may have had some compelling motive to make that entry in those conditions… but IMHO he appears to have exercised extraordinarily poor judgment, I would certainly decline to go to sea with such a captain…
Making a downwind approach in breaking/cresting seas to such an entry verges on the suicidal. Once that boat started to surf, they were simply along for the ride, and he was fortunate indeed to have been able to apply such effective steerage in water so intensely aerated… Had they been aboard a less responsive design, in all probability they would have broached right into the weather breakwater, and chances are that moron on the foredeck would be dead…
The only way, in my opinion, to have approached that entry was from downwind, motorsailing close-hauled with a deeply reefed main or trysail. Carefully forereaching into a position close to the entrance, observing the pattern of the seas to windward, biding your time until an opportune lull, then turning sharply for the entrance when the moment seemed right….
Granted, there doesn't appear to be too much sea room to leeward off Svenske Havn in those conditions:
But still, a more sensible approach could have been made by basically heaving-to slightly downwind or abeam of the entrance, and crabbing or "feathering" one's way into an approach…
But, to this particular armchair sailor, what really speaks volumes about the foolhardiness of this skipper and crew is the total absence of either life jackets or safety harnesses among them, as best I can tell from the video… I'll be the first to admit, I can be pretty lax about their use at times, but unquestionably that situation clearly calls for everyone on deck to be clipped in… (Hell, I would have preferred to see everyone but the helmsman and perhaps a "spotter" watching the seas astern to have been placed belowdecks for that approach, but that's probably just me) Not to mention, I can't imagine what would compel a skipper to permit the completely needless presence of one of the crew at the bow in such a situation, and the fact that he appeared to be un-tethered absolutely boggles the mind…