These are not bladeless fans, which actually have an internal blade.

Right, that's a marketing brand, not an accurate description. Bladeless fans do not have blades. I'm referring to solid state fans. They use charged plates to ionize air and produce wind. That's how those silent ionic air purifiers work.

This is just one of those air purifiers, but with a much lighter frame, multiple ionizing lattices, and, presumably, a higher voltage.

If you watch again, you'll see a central fan that I think provides most of the heavy lifting, leaving the lighter balancing work to the ion propulsion - akin to balancing a top but MUCH trickier without the spinning centrifugal stabilization.

Interesting. That makes sense. I did notice that, but thought it was just a cooling fan for the electronics. That does make this a lot less interesting, but I guess there's some practicality in having a drone with only one fan instead of 4. That would still be a lot more quiet, as well as mechanically simpler.