I say foolish! Even if he is a specialist in "cluster balloons."
There are safer ways to cross the Atlantic.
At least he's attached to the balloons in a lifeboat this time - instead of in an office chair:
On previous flights Trappe travelled on an office chair suspended by the balloons. On this trip, he is travelling inside a small yellow lifeboat. "If I touch down on water then the attempt will be over as it will be impossible to take off again, but the boat will keep me alive," he said.