I think if you're a YouTube narcissist, you leave everything in that attracts attention and views. Now of course maybe if your ego is especially fragile, you edit out anything that makes you look bad. (Bad in your own opinion, mind you. There were numerous things left in that make him look bad in my opinion, but I digress.) So maybe he thought he sounded panicky on the radio, and maybe he thought he looked inept trying to restart the engine (or maybe he was too dumb to try either of those), but that still leaves the moment the engine quits - why leave that out?
Now you know what they say about assume: it puts U between me and some ass. Which I don't appreciate. But nonetheless I assume that moment is not shown from the cockpit camera because he killed the engine. And if he killed the engine, he probably never tried to restart it, and never made any radio calls.
It's kind of like when your cell phone is turned off all day, on the same day your spouse happens to get murdered. Nobody can triangulate & prove you were at the crime scene... but.........