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This ignores the fact that they had radar lock as well, as detailed by pilots and Radar operators. Radar data is always classified unfortunately.

Toward the end of the video he says that it's likely a jet engine far in the distance.

If it's moving very quickly orthoginal to it's engine, then sure: https://www.reddit.com/r/ufo/comments/e9hu6k/cool_perspectiv...

I think more plausibly it is some kind of radar reflector https://www.thedrive.com/the-war-zone/28640/could-some-of-th...

Yes, and Mick West made more on that and similar topics:

https://www.youtube.com/watch?v=Q7jcBGLIpus

seems like this video mainly just shows that it wasnt rotating as much as it looks like in the video, not sure how it proves/disproves anything else about the UFO

Would you still consider it a "good take down" if he turns out to be wrong ? Or are you 100% certain that he's right ?

It would still be a good takedown of the questionable parts of the NYT article, but no, I don't think it's "100% certainty" about the actual event, despite his YouTube title. It just has the benefit of having a strong prior than the UFO theory