Highly recommend everyone give this a listen. It covered most of the other possibilities people are bringing up in this thread:

• They have to be pulled out, moved, and pushed back in to change the state
• The plane cannot take off with them in the wrong position
• There is no procedure to ever toggle both off at the same time, and no procedure to toggle them off period at their low altitude
• Both were toggled off within 1 seconds of each other
• The engines were functioning normally when they were toggled off

Captain Steve really tried to not blame the pilots in previous videos about this crash, in fact he really believed it had to be something else, so it says a lot that this is the only conclusion he can come up with.