It's the Apostle of Peace. IMHO, this is just a typo; the PrC may have been written prior to the final edits on the feat. Given that there are two restrictions here (the PrC's and the feat's), and that the feat is a prereq for the PrC, I'd say the more restrictive prohibition (the feat's) controls. You could also read it differently, to the effect that if an AoP uses defensive magic items, he loses the benefits of the VoP feat, but not his class abilities, but that if he uses an offensive magic item, he loses his class abilities as well.