I think people are taking the impressions of the people who shot these videos far too seriously. I can't imagine that they knew that the ICON A5 is an amphibious aircraft and that for it to be flying that close to the water is not something that necessarily dangerous. I can imagine that a pilot would make a lot of practice runs towards the water while learning how to fly a new plane to learn how it feels and to anticipate how close it looks before you actually do a water landing.
I would also not rule out mechanical failure or something with the aircraft design until it is ruled out by the investigations. I find it very suspicious that the planes lead engineer and chief test pilot died earlier this year from a crash at low altitude.
On May 8, 2017, a factory-owned A5 crashed on the shore of Lake Berryessa in Napa County, California, near the company's training facility. Killed in the accident were two Icon employees: lead engineer and chief company test pilot Jon Karkow, who was the pilot in command; and Cagri Sever, Icon's director of engineering, who was a passenger on the flight. Karkow had been involved in the design of the A5's folding wings as well as parts of the aircraft's control systems. Just prior to the crash the aircraft was witnessed maneuvering at very low altitude and entering a narrow canyon, when, at high power, it pitched up and rolled to the left, impacting terrain