It's gorgeous, it's amazing, it's impossible for a boat to do 230 MPH with that design, the drag would be ridiculous.
So when you say "Concept" here -- are you always referring to something that has not been actually BUILT? Is this thing another virtual wonder of smoke and mirrors, or are we ... wait. I see, +Chris Roberts
points out that there's a small transcription problem, and from the original article it appears the thing may not quite exist for real yet, but it will.
Assuming they CAN get the car made, it's possible to meet that spec, and we'll see if a yacht that size can sustain 50 knots for any kind of distance at all, but with that in mind, I'd like to see what the results really are.