Exactly.
I’m no doctor but I am SURE there are many “events” that do not disrupt the breathing pattern that much.
Nor, for that matter, do we know if it is absolutely clear. Usually the investigators have to piddle with the sound to pick out things like that.
This is mostly suspicious, but there IS still a possibility this is a horrible accident. I cannot believe they are mouthing off about this so soon. I can’t believe they have this much information so soon. It’s never this easy.
An incapacitated pilot CANNOT keep the cockpit door locked indefinitely. The pilot outside could have punched an access code on a keypad to gain entry otherwise. That is how they know this crash was an itentional act. The co-pilot apparently kept resetting the door lock to keep the senior pilot out.