asAs written, yes.
entitled to a Reflex saving throw (DC 15) each time he is struck by such a weapon [...] success indicates that the wearer takes only half damage
vs.
If she makes a successful Reflex saving throw against an attack that normally deals half damage on a successful save, she instead takes no damage
youYou could argue that "normally" is not covered by "wearing a special magical armor", but then again, it is normal to have a reflexReflex save against those attacks when you wear that armor.