Extensive Testing (by this I mean 2 sci ships, 1 spec'd into sensors and the other not) has revealed that this power is not buffed by Starship Sensors.
Sensor Scan shows the same 67.6% debuff on both ships at 125 Aux Power.
A fleetmate says that FOMM is showing the same thing. No affect from Starship Sensors. I trust him implicitly and he adds this has been this way since S4. All tooltips still say they should be affected by sensors.
So basically, the only part of Starship Sensors that appears to be working is Stealth Detection.