My main goal with the video was to show you that there is more than one way to exercise even if it doesn't look the same.
If your goal is to get stronger at pull
ups,
Using different tools and environments will get you much stronger at them since you will be prepared for the different grips & bar sizes.
So that is it today,
Place a book under the door,
crank a few pull ups & let me know how it goes ;)