Really? I...honestly don't believe that. Whenever a mortar autofires at a unit that was already moving it always seems like the round will be centered around where the unit is rather than scattering randomly at where it was when the mortar played the firing animation.
When are you going to actually fix the bulletins instead of making them increase scatter?
I think the barrage of mortar can see through the fog, That's why he knows where this any unit