[Galahad]

Yes.

FNP is NOT a save. What it is is a roll to see if you can ignore the wound, not a roll to stop you from being wounded.

So Lucius makes his save, the attacker takes his wound (or rolls an invul save if he has one), and then makes a FNP check to see if he can ignore it.

There may be some issue with the fact that close combat attacks that ignore saves can't be subject to FNP...but the argument can be made that this isn't a close combat attack. It's a wound caused by a special ability that does not specifically simulate a close combat attack.

 

[Galahad]

Sure.

But is the armor a Weapon?

FNP says it doesn't work against "Close Combat Weapons that ignore Armour Saves" not hits or effects or even wargear.

Strictly speaking, the armor isn't a weapon, nor does it act like a weapon (Like a servo arm would).

 

[Galahad]

indeed.
They call it a hit because you still need to roll to wound.
Does the armor give you an extra attack in close combat for having two weapons?
Does the armor ever actually say it counts as or is treated as a close combat weapon, or replicates an existing weapon? does it say "The model is treated as being hit by a S4 power weapon?"

Nope.
Not a weapon.

Just like suffering damage from a failed dangerous terrain test doesn't count as a close combat weapon, even though it ignores saves and happens up close..