The Twin Otter handles a strong crosswind very well. Being a high wing aircraft, you can lower that wing down into the crosswind a significant amount. It has a big rudder which also helps. I don't know the length of this runway but in non-STOL ops at flaps 20, it can still land in a fairly short distance.
The runway looks reasonably long in the video. I think a better landing technique might have been a fair amount of wing down and a better flare instead of forcing it on. The wind wasn't even that strong or at too much of an angle to the runway according to the windsock.