I have followed Oskar's testing for a while now
I believe he uses the original Mosquito helicopter freewheel unit
He was very thorough , all his initial testing was tethered flight , measured lift and thrust and electric consumption in all parameters.
He demonstrated an auto in the video ... how can anyone say it will not auto ??
Yaw control would not be lost if main electric motor failed
Loss of yaw control would require total battery failure ... big difference.
Beloved Billion dollar Sikorsky engineers built an all electric Hughes 269
But did not show it actually flying
Home built experimenter Oskar built one from his grocery money
And it actually flies.
Big difference