Interesting video. You would need to do a proper motorcycle test in the UK to ride something like that, CBT at the bare minimum. Along with have it registered and insured as what ever type of motorcycle it fits into based on its power and top speed. To count as an ebike the motor must be pedal assist and can only assist up to about 25kph. Of course this only applies to public roads. On your own land you can buy a 5kW ebike and no one will stop you from using it uninsured. But I wonder how much this impacts the type of injuries seen if a lot of Americans are using ebikes that can go much faster? People here do sometimes illegally use ebikes that fit into motorcycle categories.

The gear generally looks ok though. Knee pads instead of proper motorcycle trousers might be ok if you are wearing them ontop of fairly sturdy trousers, given that biker trousers are often just sturdy material with built in knee pads. Look into kevlar jeans, they are generally alright for abrasion but lack any impact protection for your knees, combined with the knee pads that should be ok. Plus you can take the knee pads off when you get off.