Being an inventor myself I looked at it and began mentally dissecting it for conceived operational flaws, weaknesses etc. then I said to myself STOP THAT!
Someone put a lot of time and thought into it, if there is a market for it people will buy it, if not it will fade away. Like the gas powered surf board. I think this would be more practical than the board was. but so was sea doo's 3D and that was a flop.
I suspect the poster is somehow involved with the product with only one post , especially when you get an invite on the site from CAZ K. that resembles the posters name . I can see people with large boats using it for a runabout to go from the boat to shore or as a toy to play with. It's interesting and inexpensive so who knows.