Why spend the time pontificating, asking others for things that are clearly explained on the website, when you could answer these questions yourself?
- they use lithium ion batteries.
- they use LEAPTech style engine layout with multiple small engines (they don't name check it, I just recognise it from https://www.nasa.gov/content/experimental-wing-tests-electri...).
- there's a backup parachute.
- they don't mention autonomous flying, but you also don't have direct control of the vehicle --- a computer mediates.
- for some reason they insist on calling ducted fans 'electric jet engines'.
That's about it. Anything I missed?
From an engineering perspective, if something produces thrust primarily by producing a jet of surrounding matter (water or air) and taking advantage of Newton's third law, I'm not sure I see the issue. There's no exposed airfoil, and it doesn't appear to care about Bernouilli's law (except for lift).