Because I have done the math...
Mic,
I don't believe because I am an engineer and have done the math. Battery and motor technology is not viable yet. And will likely not be for 10 to 20 years at best.
Regarding scale, the founder stated "This is the original size of our previous two-seated concept". He did not state it it was the same generous size as the mockup shown earlier in the video. I believe it is about 3/4 scale at best.
Regarding weight, I have seen mockups of full scale cars flying. Using one or two pies of composite cloth you could make a good scale size Lilium model that weighed under a 60 lbs fly. But this is far less difficult than what is required to make a real two passenger weight aircraft fly.
So give me real dimensions and weight of what is flying in the video. Then I can check my math.