That's not quite true Stormy.
You get a split of Federation Combat Rank progression as long as you tag the NPC, and then your SLF crew kills the enemy.
This is slower than killing everything yourself, but it is a lazier / easier way to rank up.
Developer confirmation of xp split:
clicky
Nemo: if you want fairly effortless combat ranking, yes even to Elite (but it'll take a while), use an all-turret conda, set turrets to "fire at will". Set the SLF to "engage at will". Then buy 10T of something expensive (like Superconductors), pirates will rock up, scan you, open fire, and then your turrets and slf will engage them.
AFK build:
https://eddp.co/u/PryGwF41
I experimented with this while doing combat rank myself, but it's not optimal from a time perspective. Best thing I found was actually to use a Python and go to an Anarchy Compromised Nav Beacon to farm enemies (yes faster than semi-AFK conda; faster than HazRES; faster than HighCZ).
You don't need anything specialised, just good recharging biweaves (the point is quick kills on small Elite ranked NPCs), with an SCB which you in theory never need, good thrusters (speed cuts down time between kills), decent weapons (dps).
Python build:
https://eddp.co/u/MzXA5tDS
Note: this AFKconda not fast, it's better to have say a gimbal on the Huge and engage pirates as normal (or use the "engage target to slf"), but let the turrets/slf do most of the work.
Double note: do not AFK. While it's fairly safe with engineering, you need to keep an eye on things in case the slf/turrets tag a friendly, get you wanted, and the cops come for you.
tl;dr Yes. You could in theory get to Elite without firing a shot, practically it'd take a while...