If you try to land parallel to the waves, you exceed the demonstrated crosswind performance of the plane (20 KTS)
Would you be worried about operating outside the POH in those circumstances?
As for the question of whether to use the chute for a ditching or not. I read all the horrors about landing on water as the landing gear is designed to collapse to absorb the energy and landing on water can result in back injury.
After watching the video I'd take the chute every time.