I initially thought you might have a slightly forward cocked wrist as mentioned by Scott but I'm wondering if it seemed that way because you have a very tight grip on the cue and your wrist is locked in a single position.
The lighting is somewhat poor in the video and it's difficult to see but it stuck me there's no flex in the wrist at all, even within the follow through, which leads me to think you might be "white knuckling" the cue stick a bit.
Given the poor quality of the video, I may be way off base but you might benefit by relaxing the grip and wrist a bit more within your delivery.
"Different strokes for different folks"...Experiment a little bit.
You are spot on in your assessment.
The tight grip can be seen in the last few shots with side pocket angle.
I'm not an instructor, but I love threads like this because it helps me review my own fundamentals.
The only reason there is no scooping in the cue tip from his practice strokes is because his shots are all soft (Not much pull back as well as follow through). I imagine there will be problems as he expands his practice to power draw shots. That grip will lead to a lot of hopping of the cue ball.
The pinned elbow will also not expose the tightened grip as well, because his follow through is only a two or three inches.
To the OP, here is an instruction video that addresses follow thorough, note the grip hand on follow through.
https://youtu.be/sjLx2jAWP0A
Good luck and keep working at it.