My wild guess (which, to be clear, is no better than all the uninformed speculation that I’m complaining about) is that (i) some kind of software fault caused both engines to throttle back to idle and that (ii) the RAT didn’t actually deploy and all the RAT commentary is a red herring. Otherwise I don’t see how to explain the fact that thrust (or lack thereof) appears to have been symmetrical throughout the flight. Both engines failing is already unlikely, but both failing at exactly the same moment? It seems incredible that any kind of failure internal to each engine could be the cause. Surely in that case we’d observe at least a momentary rudder deflection, if not a visible yawing motion of the aircraft itself.