Dangerous, overpowered and IMHO this is not what e-bikes are about: I can’t tell from the video, but I doubt he was doing much pedaling on that contraption and I think these are types of projects that e-bike users a bad rep. For this kind of speed/power/usage he should have invested in an electric motorcycle that is actually engineered to handle the massive torque/acceleration that electric motors can provide. There are actually 5Kw motors available, but when you have your front lifting up at speed with a lot of battery weight working against it, I think it’s time to reconsider your design. The only things he said in the video that make sense to me are steel being better than aluminum for the frame due to its superior stress properties (that is all I use for my builds) and the fact that you need high quality disc brakes for e-bikes, but what about all other critical components in a bike? Spokes, tires, chain, gear cassette, etc. He should start thinking about upgrading these as well and perhaps invest in a set of quality alloy wheels, maybe steel ones, so that he can keep its front wheel on the road at speed, in essence he should be building a quality electric-powered motorcycle with pedals because that’s what that thing is 
Sorry, this is not an e-bike, not a safe & useful one, anyway - just my 2 1/2 shekels…
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