To be fair, I think this is very doable with modern technology. If you've seen their rocket landing videos the technology is quite similar in nature.

The gimmicky part is not the engineering but the fact that it is not a flying car but a proof of concept of a flying car in a very controlled environment, with no regard for cost, with no actual viability of real world use.

Its like the breakdancing humanoid robots in China, a cool feat of engineering for sure, but it makes you think that robots can do human tasks, when the reality is much further away.