I just used this on 3 Midgard security in the Midgard Warehouse. It was the only technique I used that round. They all used Dive for Cover, but it didn't seem to have avoided any damage for them and I won the fight. Maybe this doesn't count as a ranged technique, or not when used against multiple enemies?
EDIT: Kinak confirms this isn't a bug. Given that you get this technique from using computer-guided bullets from a smart clip, I wouldn't be surprised if Dive for Cover and other evasion techniques that would ordinarily work vs. ranged attacks don't work against it.
EDIT AGAIN: Used it against one Midgard Security and his dive for cover did evade a bunch of damage. Since the damage evasion message is appended to your attack text rather then the "He dives for cover' part, maybe it just doesn't show the evasion vs. multiple opponents. We'd have to spade to see whether they're actually evading it anyway or not.