Im fairly sure that if a hero has citadel plate plus say seven wounds, if they then lose-attachments then the plate goes, the wounds remain (because the card text doesnt say the wounds are attached to it) and thus then the hero has seven wounds and dies.
However, thematically i see the reason the plate adds wounds is because a sword strike that would cause a deep gash in an arm (a wound) instead damages the armour and its the armour that absorbs the wound, thus if the armour is discarded the wound would go with it.
Thematically it seems a bit of a shame the card text doesnt say wounds can be attributed and attached to the citadel plate rather than the character (which would then call into doubt if they would add to gimlis card effect because "he" wouldnt have the wounds).
Any thoughts?