This guy is a true aviator,
I think this guy is a nutter.
Having set off down the hill, he is totally commited. There is no way he can apply brakes if he had a change of mind, or he would be straight up on his nose, and worse.
If he had by some chance found himself where he was by accident, and his engine was u/s, and it was his only option, you pays your money and you takes your chance.
But to risk what appears to be a serviceable aircraft just to see if it can be done says too much spare cash/not enough between the ears to me!