Storm in a teacup.
Reality is this EMA changes nothing - it can’t change the outcome of an attack - real or fictional - and nor will people die as a direct result of it.
What is more worrying is when people are relying on software to perform actions that - if wrong - may result in many fatalities. Starting with train control systems, and aircraft.
Almost as bad are situations where humans (such as pilots) rely on software systems to make decisions that will affect the lives of many, possibly hundreds or millions.
I’m far more worried about the integrity of the software used to inform the the head of state and military in the US, Russia and China of an attack - if any of them gives a false alarm there’s a real possibility a counter strike will be initiated that starts WW III.
Thankfully they have old-tech telephones and still know how to use them.