So (correct me if I am misquoting you, please) you are seriously suggesting that the aircraft's final ADS-B squitter indicated a true altitude of zero, presumably at the point where (obviously intact, despite no voice or ATC comms during the descent from FL350) it impacted the sea.
Which bit of your scenario have I got wrong?
No sorry I apologise, what I was basically saying is last night people discredited FR24, but now the location FR24 last broadcast the flight seems to be fairly accurate, although admittedly as there is no wreckage that's unconfirmed. And of course you are correct, the final altitude and speed are erroneous on FR24, sorry if I implied the opposite.