I didn't see any pictures close enough to identify the instruments; they all appeared rather small. However, an altimeter is important in a seaplane in many cases due to the inability to gage height above the water. I would think a radar altimeter would be especially useful in this application.
The design appears to have a lot of merit. It's not an airplane; it's a boat with reduced drag. Interisland shuttle or ferry, ambulance, etc. It would also have some interesting application to marshy or snowy areas, ice, etc. Don't be too quick to knock down new technology, especially when aviation has been lagging for years.
Over the years several designs have come along which do what this design is intended to do, abeit for slightly different applications. I think it's a good idea; only time will tell if it finds acceptance. It has the advantage of getting the hull out of the water in the event of submerged articles, can be relocated quickly, never has to worry about a reef, and it doesn't sit in one spot long enough to be hit by surfacing US submarines. That's got to be a good thing!