WotC owns the magazines; Paizo simply has the license to produce them. Therefore, everything that goes into either magazine is read and approved by WotC before it sees print, which is what lets us put "100% Official Content" and the D&D logo on the covers.
Just out of curiousity, is it really meticulously scrutinized by WotC or are you guys given some credence for having such high standards placed on you in the first place (i.e: it's read over for obvious error)?