CT might want to comment further, but from the get-go I can say that I will be likely quite hard for him to properly analyse your form given how bad the lighting is in your video.
From what I can see, I would put more emphasis on maintaining the triple extension at the top and really accentuating the plantar flexion.
Also, your elbows seem to be pulling back instead of upwards when the barbell reaches the top of your movement/sternum.
For the muscularity aspect: you’re under tension for less than 10 seconds total on the video, so I wouldn’t look at this as primarily a hypertrophic muscle-builder and more as an explosive movement pattern that will help you for your snatch. I know CT is a big fan of this movement for building traps, but I doubt that heavy low-rep work with very little TUT will do much.
Personally, my traps have grown much more from when I did crossfit, more specifically during WODs where there were many consecutive reps (let’s say at least 10-15) of power snatches with a lighter weight. Then again, I am more slow-twitch, so I might be biased.