AFAIK the main point of the kip is to turn pullups into an aerobic exercise instead of just a purely strength exercise. Yes, you can do more, but that's not the point.
Well, now that I think about it, I guess that being able to do more is also kind of the point. A person who can't do any real pullups, is more likely to be able to do 1 kipping pullup. Even somebody who could do 2 or 3 or maybe even 4 (?) kipping pullups might not be able to do a single dead-hang pullup. (I'm not a Crossfit person, I have never tried kipping pullups, but I have read some about it. I don't know the ratios here. I am able to do 1 (maybe 2 on a good day) dead-hang pullups now, but about 2 years ago I had worked up to being able to do 4.) But it seems that going from 4 to 5 kipping pullups is not that big a deal, but going from 0 to 1 dead-hang pullups could take weeks of training, and going from 1 to 2 can take a long time as well. Basically kipping makes it easier to increment and see progress in your workout, as well as turning it into more of an aerobic exercise with fast movement and engagement of more muscle groups.
The first video is a joke, for sure. The second video... who knows?