Yes the guy is definitely genuine. And like you, I have never used drugs.
Can't explain the hair thing........most strange. I find that wearing a 2" band round my upper arm, gives me more control. I don't have dyskinesia though, I have bradykinesia and therefore slow movement.
I have a friend with PD, who shakes, but paints lovely delicate pictures. The shakes stop, as soon as she puts brush to paper.
Like you say, the brain in very complex and seems capable of many surprises. Just wish they'd make some headway in finding a cure!