There were exactly 2 videos in there that were close enough to record a jet engine sound, and neither was close enough to detect a doppler shift of the engine coming towards it. Given that this was a well planned operation, I am not convinced that it can be conclusively ruled out that these 2 (only 2) videos had sound edited in afterwards before being released to the public.

You do not have to believe the theory. I am not saying it is true. But calling it "dumb" is jumping to a conclusion absolutely not supported by all the available data. Certainly not by the video clip you post above. The theory may be wrong, but not dumb.