Interesting. Find it strange they call it hässlich (ugly). There are so many more much uglier cars on the road. I'd rather call this design unconspicuous, or even unpretentious.
Whether the idea with the moss is any good, only time will tell. The trouble with living stuff is that it usually develops it's own idea where and in which shape and colour it will grow. Also, the intented usage might lead to it filter out dust, and shift the colour towards a truely ugly grey.
And that plug-in lead on the front of the car looks suspiciously slender. Presumably the charge rate tops out at about 500W...?
They claim to fully charge an empty battery in one hour. But of course it is always a healthy approach to stay suspicious of such numbers, like also the other numbers on that website.
Cheers Peter