That's only the reminder in the sense of "I've made other videos before about that" of Mick West. The relevant playlist of Mick West with many videos with detailed analysis is:
how the appearance of the "fast movement" is actually due to the plane speed, not the speed of the object observed, which is almost certainly something simple like a weather balloon
https://www.youtube.com/playlist?list=PL-4ZqTjKmhn5Qr0tCHkCV...
For example
https://youtu.be/4Btns91W5J8
Explains how the camera's automatic tracking system contributes to the appearance of movements which aren't real at all.
Or:
https://youtu.be/PLyEO0jNt6M
how the appearance of the "fast movement" is actually due to the plane speed, not the speed of the object observed, which is almost certainly something simple like a weather balloon
...and much more details there.