Jam Targeting Sensors only works on one target and it keeps that target from being able to shoot you for X seconds.
The ability this thread is about is Scramble Sensors, which is an AoE confuse.
I think he was saying that the Bridge Officer Trainer offers both "Jam Sensors" and "Jam Targeting Sensors," where the former is the ability you just described and the latter is a mis-named "Scramble Sensors." A bit of searching on the forums seems to confirm that.
And yes, Scramble Sensors was my favorite skill during Open Beta. I need to train one of my science officers in it as soon as I get a lieutenant science seat.