Well, reading the report, there seems to be some ambiguity. It’s unclear if the recorder is based off of the physical position of the fuel cutoff switches or off of a digital reading.
I have flown the 787. As for the switches themselves, they are in a detente and you have to pull them against a spring and over a notch to move them to the off position. It’s hard to imagine how they would be moved unintentionally, especially by these experienced pilots. The report says they were shut off within 1 second of each other.
One of the pilots asks the other why they shut off the switches, the other pilot denies it, and shortly afterwards they are turned back on but by then it’s too late.
So, I can see where the “murder/suicide” people are coming from, but it’s important to understand that this report is the preliminary report mandated by ICAO and is for informational purposes only. Only the final report will determine a probable cause for the accident, if it can be determined, and looking at the facts, it’s unlikely that they can come to a definite conclusion, since there is no video footage of the cockpit. If there was something wrong with the switches, they will be very lucky if they can still tell. If one of the pilots switched them off, it’s impossible to know which one and why, and who turned them back on (and if it was the same pilot after realizing a mistake).