inured to pain or whatever

You neither suffer nor lose wounds until after the save is rolled and you can take the extra save against mortal wounds too (as per designers commentary).

The only stuff I could find in FAQ's and designer commentary was regarding abilities that state "loses a wound". This might be me applying faulty logic, but from what I was reading and from AoS rulesets, loses a wound means after damage on d3/d6 damage is rolled and applied to models, while suffers a wound would occur before damage on dx attacks is rolled, but after any armor/invul saves. The idea being the unit has suffered an unsaved wounding blow at that point, whereas the wound on the model isn't lost until after d3/d6 rolls have occurred and wounds have been allocated to models.

Like you were saying the confusion is due to "wound" being used for two different concepts. I could also be completley wrong here, but I was working off the fact that no "suffers" worded abilities have ever been mentioned in any errata that I can find and that mortal wound saves in particular are supposed to be exceptionally rare and only granted if specified.

I don't think there is any in-game distinction between losing and suffering wounds and the FAQ seems to make it clear that such abilities are rolled for each wound lost/suffered and that they can also be rolled against mortal wounds.

@TrawlingCleaner wrote:

You roll for each WOUND you take.
Example: person a wounds one of you models. You fail the save and the weapon causes 2 wounds. You roll 2 dice in this case.
It makes sense because otherwise someone could get lucky and block a six damage weapon with just one roll

This is correct for feel no pain style abilities but not Armour saves