It probably needn't be pointed out, but I believe Chuck's experience includes considerable water flying too.
It does, I received my seaplane rating in 1954 and I can't even remember the different seaplanes I have flown.....but as an example I have well over four thousand hours on the PBY and a lot of it was teaching others.
In my opinion abrupt bank angle changes such as I saw in that video that close to the water is very high risk for any pilot because just a slight error in pitch control can result in flying into the water.
Fun flying is one thing, but high risk taking can quickly change fun into disaster.