Wow, they’ve come to this conclusion by making a hell of a lot assumptions, based on some pretty loose “factual?” evidence. How about keeping an open mind? How about this for an alternative. e.g. Meteorite fragment impact to cockpit, causing rapid depressurization and hypoxia to all on board. This gels with sonic boom heard by beachgoers, seafloor seismic event detected, and daughter meteor being observed burning up by oil rig worker. Progressive degradation to telemetry systems as they fizzle out (have you ever had a damaged computer behave as if it has a mind of its own..) whilst spitting out errant data +40000 ft altitude etc, whilst the plane continued on a northerly track. It crossed Cambodia/Thailand/Laos and into China not being noticed by anyone’s primary radars, both civil and military included (just think how embarrassing this would be). In the current flightpath scenario it was not detected by either Thai and/or Indonesian civil/military primary radars. The triangulated Inmarsat positions based upon “ping” data could have an alternate solution north of the equator (assuming they are in geostationary orbit), and the plane has come down when fuel exhausted un-noticed in Outer Mongolia… We will never know conclusively until wreckage is found. I am just a little concerned that the “highjacking” explanation is a little too convenient for governments concerned.
