Didn't the shit he built go around 60 mph?
How is that too slow for traffic? Just don't take it on the freeway.
And yeah, many places you will probably need a motorcycle license since it's a electric motorcycle, as well as get it reg and insured.
It's the reason why so many electric mopeds are built as e-bikes rather then pure electric mopeds, with easily modifiable limiters that you can turn off and one depending on where you are riding. It makes them fall into a way more flexible gray area that hasn't yet been regulated into the ground like almost everything else.