Weren't there reports of extreme turbulence in the area?? I know there's a certain YouTuber out there talking about spatial disorientation but I think this is leaning more to the plane just falling out of the sky due to something failing mechanically. They found the tail horizontal stabilizer about 3/4 of a mile from the airplane along with part of the right wing.

Edit*

If you look at the flight data, he was flying straight and climbing before the right hand turn into the dive. It seemed to me that a mechanical issue might have caused loss of control which then caused additional breakage aka that right wing tip. There is a weird right turn left. Turn correction but at that point he starts climbing for quite a distance before the issue seems to happen. Therefore, leading me to believe that it wasn't necessarily spatial disorientation but mechanical failure. I'm no way educated to make this guess.