EMP meaning nuclear explosion generated EMP. The specific characteristics of any nuclear EMP weapon would vary according to many factors, the most important of which would be the altitude of a detonation. If by “do not have an ability for EMP” you mean they cannot control a specific effective altitude for detonation— you have a point. But, if they can only hit within a poor percentage range of target— the explosion, if not incomplete, could wreak a fair amount of damage on, say— silicon valley.
That would be true if a Low Bomber could make it in.
I doubt those odds.
It does require an altitude above mean 0 and probably 2000 AGL.