Starhawk's last post was clearly referring to a mod.
In the unmodded game, PDC has a +70% accuracy advantage on top of combat sensors and training (which fighters don't have, in addition to their ECM being worse than ship ECM), and like all to-hit mods in SE4, it ADDS - 70% is an enormous extra shift.
Auto-targetting generally means PDC get more shots in, and concentrate on moving PD targets as they come in, and generally have greater range than fighters, and incoming fighters fire at the end of their movement, so a fighter stack gets nailed by all enemy ship PDC in range before it gets a shot off.