That is a good video.
The move I’m talking about is more like this.
Horizontal Band, Horizontal Handle.
With handle at shoulder height, at arms length out to your side, overhand grip. (description and pics don’t match.)
Then turn the thumb up/engage serratus, just like in the mercy for a gladiator motion.
Really, really focus on a straight arm, rotation of the upper arm and good scap tilt as you twist.