No, the only place it touches you is where the “comfort ring” rests against your fat pad and testicles. So the actual vacuum, while you feel it, it’s not providing you with any friction. Your penis is just kind of suspended in the hot water.
And that DLD guy is a bit of a shyster, so I think I checked out that workout at one time, and decided it was just way too much work. One of those workouts that suffers from the idea that the more exercises you do, the quicker you’ll gain. And it’s just not true in my experience. At 600 jelqs and 1/2 hour of pumping, I’m already thinking my workout is probably too much.
Edit: I just went to the MOS site and read DLD’s rundown on the Bathmate and that dude is just full of crap. He claims over 7 inches in girth post pump session. The interior of the Hercules is only 6 5/8” at the fat end. Really just one ridiculous claim after another over there. Not that the Bathmate isn’t a good piece of PE equipment, but with a max interior circumference of 6 5/8”, and max length of around 8-8 1/2”, It would be unuseable by someone with a girth of 6 5/8” and length of 10 1/2”. I really get mad when people lie.