There's no such thing as "force attack", there are 5 different damage types in the game; kinetic, energy, internal, elemental and weapon damage. Force attack is only used to describe kinetic or energy damage made by force using classes. And kinetic and energy damage is mitigated by armor thus is "force attacks" mitigated by armor.
there's actually only 4 damage types: internal, energy, elemental, and kinetic.
There are 4 attack types: Melee, Ranged, Tech, and Force
you are mixing up your terminalogy, and/or choosing to misread mine.
i didn't say "force damage", i said force attack.
if you want to be more technical about it, armor only defends against energy and and kinetic damage - ie, the 2 types of damage not done by most force attacks.