Suicide is quite a stretch without any supporting evidence from the pilots' backgrounds. I would take mental fog, cognitive overload, wrong muscle memory, even a defective fuel cutoff system over suicide.
Agreed. The sequence of events also supports this.
I believe one of the pilots made a terrible muscle memory mistake and cutoff the fuel instead of raising the landing gear. This would explain why the landing gear was never raised, why the pilot who was accused of cutting off the fuel denied it (in his mind he had only retracted the landing gear) and why the engines were turned back on after presumably realizing the mistake.
The pilot denies shutting off the fuel, then realises he'd done it accidentally and quietly reenables them hoping there's enough time to save them
¹) https://youtu.be/RbmFmWqqq0c?t=19
²) https://youtu.be/33hG9-BCJVQ?t=5
(I'm not an expert, I just watched these videos)