I think there may be one or two tiny problems - it looks to me like it's using ground effect for at least some of its lift and is still barely getting off the ground, and control looks just a bit unstable. And I suspect that if one motor fails you will be heading for a chain reaction with less stability, more stress on the remaining motors, etc...
This one looks a little more practical
but I'd be more impressed if they had footage of it flying outdoors.
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