When you have an engine failure, don't you think the most exciting, watchable, share-able drama would happen inside the cockpit? He has a camera in the cockpit, but he chose to only show footage from takeoff, cruise, and ditch.

If attempts at recovery, contacting ATC, or searching for a safe landing ever occurred, he chose not to include them. Which is very strange for a person who is clearly editing for drama and virality in the rest of the video. Why didn't he include that footage?

A reasonable suspicion therefore is that he didn't include them because he didn't have any footage of them, because he never tried to restart the engine or call for help, because he wanted the drama of the ditch and crash.

Per the comment you're replying to, "...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."

Well you're sort of re-stating my point, except in terms of believability instead of interest/drama. In the scenario where he's faking the video, that part is the part that's fake and ruins the believability.