"Olmedo said the technique is safe and means the hair to not damaged by cutting." I'm no expert on hair, but I think burning is going to be worse in all respects as opposed to cutting.
That 3-6W beam although not corrected post-colimation has a high divergence, but you can see he's pointing it directly out a plate glass window that's about than a meter from the source. If the dude wants to blind himself, that's his business, but the poor people on the sidewalk outside . . .
-David
"Help, help, I'm being repressed!"