That was his point, I think. There are ways to be nice with it and ways that aren't as nice. The nice ways create discomfort to help get the person into a position for control. The less-nice ones often focus on taking the arm out of the fight.His shoulder has to be lower than yours for that to work. So the rubbing the tricept is pretty meh..
I mean it is irritating but not really devastating.
ignore the rubbish about BJJ being the answer to everything. just a convenient video of police fighting on arm bars.