Very interesting. Not that I am going to run out an buy a bunch of rabbits or anything, but it's cause for pause. It's good that they don't shear the rabbits like with sheep. Poor things would probably be completely freaked out by that. Brushing is almost like petting.
I did see some video's off to the side that did show shearing but I don't like the idea. The brushing method is less stressful on the rabbits. Rabbit fiber is very popular and very warm. I read somewhere that it was actually warmer than wool.