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Oh, this'll blow your mind. Digital cameras don't capture the entire image all at once. They typically capture one row of pixels at a time, so each row comes from a different moment in time.
So the point I was alluding to is that two adjacent frames in a video carry slightly more timing information than they might appear to based on timestamps.
Specifically, if you have two frames where a dot appears at the bottom and then a second dot appears at the top, you can't be 100% certain that the first dot to appear actually showed up first, or whether it's an artifact of the rolling shutter effect.
https://en.wikipedia.org/wiki/Rolling_shutter
I'll check out the wiki, but your explanation is pretty simple to understand and concise! Well done and thanks so much!
ETA: just read it. Those distortions in the propeller and helicopter blades are wild. While not being a fan of car dealerships, I'm also not a fan of insurance companies. It would be fascinating to know the answer to this mystery.