please. pilot puts everyone to sleep but himself, turns everything off, then does a flyby of his hometown and then puts himself to sleep? the only one more obvious is the german one.
without a black box all of this is supposition.
We know the transponder was manually turned off because of the intermediate mode. The only reason for this is intentional disappearance.
Hence the question mark
It feels quite uncomfortable to me. I remember using this exact example of why the changes after the German wings crash wouldn't prevent a murder suicide in the future.