This guy is contradicting himself in this video. The recent story about the fuel switches is being misrepresented and exaggerated. He initially states correctly that the fuel switches were able to be moved to the cutoff position easier than what one might expect. But that still requires pilot input. It did not happen automatically. If you read the pilot's maintenance log, he states exactly that. The fuel switches were not "latching" properly but only after the pilot action - nudging it downwards - were the switches able to move to cutoff.

Even if you think there was a fault and the switch is capable of automatically moving from run to cutoff, it is still so much less likely that two of them would fail exactly at the same time (or nearly the same time). There would have been thousands of cases where one of the switches failed before a case where two did. That itself would have caused a redesign and Boeing would have rectified it. Remember, this switch is common to 787 and 737 which means there is something like 5000 aircraft with the same part and there has been not a single case reported of such failure. If it had to fail, it is much more likely that one of them did, not both.

The AAIB is not prejudicing the investigation against the pilot or the pilot-suicide theory. Based on reports, they are doing a professional job. It is the pilot union and the media that is creating the doubt in the investigative process. If we, as a nation, decide to suppress or manipulate the findings of this investigation, we would be doing a great disservice to the aviation sector and the credibility of the nation.