You should learn to be a little more observant. Notice that there are at least 3 heavy bags, 5 shields and a bunch of focus targets... that all look well used... in a school that teaches JKA Shotokan Karate.
Here you go, same school, different video:
Looks like a class to me... at least three students working heavy bags... in a JKA Shotokan school. (One black belt, one green belt... can't see the belt of the 3rd guy)
They have a ton more videos using heavy bags... but you are right, most of the videos are showing the drills, not showing the class doing them... that does not mean they don't do them in class...