I'm new to this website. I hope it takes off. I never thought of doing pullups with a bar in a squat rack as you have. That would be a good way to train them from time to time even in a commercial gym (after we get off our house arrest, lol) as it will allow the bar to rotate a little. I have my reasons for liking that - it will hit the grip a little bit harder.
I'm really happy that the video was useful to you who is thanks for the feedback!