I did find it choppy, also. I think that's an effect of the scrolling algorithm's acceleration/deceleration, and could be adjusted. There are two effects with scrolling--advancing the page/narrative, and advancing the video. That transition benefits with subtle visual signals.

And, I'm not much into video editing, but I've done a little graphic design practice. I think 'disorientation' is par for the course when you're not playing a video at constant speed. That's an unsettling thought--the webpage authors are taking advantage of the UX's disorientation effect to heighten the emotion of the video content.

I watched all of these videos and they certainly don't need any additional emotive effects. I had the feeling that I was sharing the privileged insight of the 'experts' observations with the narrative callouts and graphics to pace my consumption.

I looked at The NY Times mega page of videos posted earlier. Watching one video after the other was brutal. And it was my own doing. I just jumped from one video to the next. click. click. click. and feeling worse and worse and worse.