That sentence does not make much sense:
1) infatry HP is 80 so if a mortar did 160 damage it would still do 80 damage to a entity.
2) Better AOE profiles means that it will have wider kill radius and will do more damage at greater distance and that actually mean that a unit with better AOE profile it does do more total damage to infatry squad.
Right. Let's cool it with the semantics for a moment here and realize that we're saying the same thing. I said "it isn't doing *more* damage", as in it's not doing more damage on a direct hit or something, it's still 60 damage. And I said "it just has better AOE". Now, if you think about that statement for a moment, you will realize that having a better AOE implies doing more damage over the area of effect.
EDIT: I'm not mentioning the delayed fuse rounds because it's not applicable to infantry, because they can just move out of the way.