Interesting video and very commendable for being honest enough to post the performance figures.
I saw figures of of the electric R44 pulling 250Nm in the hover (the Lycoming IO-540 is rated at 168Kw or roughly 168Nm) and this electric version was using 30% more torque when single pilot.
I also saw figures of 250 Amps being used, the latest Tesla P100D is rated at 100 Amps and if used at once then a cooling period is required, if done regularly then a new set of batteries are in order.
Finally, the flight test was done in 2016, over 2 years ago. If this electric caper was really viable I would guess we would be seeing more recent videos and better performance figures, but alas, we are well and truly stuck with the same problem that has plagued this technology since the times of the ancient Egyptians - the battery.