It is possible according to this that when power was cut to go dark the oxygen to the passengers/crew was cut at the same time. Those 7 minutes between 18:22 and 18:29 might be when everyone but the pilot succumbed to hypoxia.
Yuppers. But we still cannot say if the plane was really flown to the south and ditched in the sea, or if it headed north. Some country’s radar system must have seen it for sure, and if so why nothing being said? Hell, they can read our license plates from a satellite. What’s the deal?