Adding a hydrofoil is a cool idea but I'm not sure that plus electric propulsion qualifies it as that novel compared to the Ekranoplan which, two paragraphs later, it describes as a 'proposed design' (also interesting wording for a vehicle with fully functional full scale prototypes). Ultimately the problem with ocean-going ground effect vehicles is that they combine the worst of both worlds; all the expense, fuel usage, load limitations and risk of a plane perpetually two seconds after takeoff, but still at the mercy of rough seas and weather like a boat.

Looking at their page, it looks like 'seaglider' is more like a model name than a vehicle classification. It's also interesting that they quote "over 325 sold with a $6bn order backlog" when they haven't even built a full sized working prototype yet. I guess they must cost $18 million each?