The youtube video makes it sound like a "failure" of the hull sinks that boat. To me the keel of a power boat is an odd place for the hull to "fail". I wonder if they hit a rock on the way out that day, didn't think much of it, but after coming off plane and letting the water soak into the hull for a few hours she capsized.

Generally, when I think of a hull failing I think of a fold when a bulkhead gives-way, etc., not what seems to be a missing chunk from the keel (though a keel falling off of a sailboat is certainly a failure that occurs).

Who knows though. Way too hard to say from the video.