That's a mess. I sure hate it for those folks. It's pretty amazing what the weight of snow and ice can do.
That video reminds me of Frisco boaters cruiser getting damaged during that ice storm that hit Dallas a few years ago.
It might have been last spring. I know their docks were in pretty bad shape, but I don't think they had any boats go down. Mostly just upper deck damage and radar archs destroyed. Along with the obvious damage to the slips themselves.
I wonder in these situations who is responsible for damages to the boats? The marina, the boat owner, or both?