For me this looks like a much, much simpler scenario. And it did happen before.
If you do not apply full thrust for the go-around (and you do not need this for an empty aircraft on training flights) you do not trigger the TOGA logic, your autopilot still tries to land the aircraft.
"the aircraft suddenly failed to respond to any inputs and shortly afterwards both engines lost power" This is what you expect from an active autopilot which you ask to land the aircraft...
Computers do not do what you want them to do, but what you ask them to do... Learn the language of the computer if you want to use it. To initiate a go-around you have to advance the throttles all the way to the TOGA detent. If you don´t, your aircraft behaves strangely and won´t go around the way you want it to.
This accident is probably the same issue as the 777 in Dubai, just on a different type of aircraft and hence a different type of fingertrouble initiating a go-around (or not initiating it...).