Sadly I don’t even think finding the plane would end the mystery. The cockpit voice recorder only records a short loop, and it’s likely the audio of the hijacking will be gone. And Malaysia will fight hard against ent evidence of the captain hijacking it. People will still pedal dumb alternative theories and conspiracy theories.
Is there evidence for this beyond a mastodon post? I can’t see enough of the map so see if it was an actual detour.