No.. This question was not particularly to you.. It was to the forum actually.. just felt impossible to maintain the speed and manuverability at that speed.. So wanted to know..
Its quiet simple. This vehicle does floats on air cushion instead of water surface unlike speed boats or powerboats. So getting unstable over waves is out of question for it. You may compare it with any simple vehicle traveling on road. Any car or bike traveling at such high speed on road does topple over only if it gets a bump like a speed breaker or uneven surface. On any smooth surface, it could top 300km without any problem.
Same is case in water. Waves does act like bumpy road surface for any fast moving boat. If you engineer a way to negotiate these waves, the ride would be as smooth as any airstrip. So by traveling on an air cushion, this Aeroboat does negotiates these bumps and is avoided from toppling over.