He referred me back to 22.214.171.124
126.96.36.199 However, if a competitor fails to satisfy the equipment or other requirements of a declared handgun Division during a course of fire, the competitor will be placed in Open Division, if available, otherwise the competitor will shoot the match for no score. If a competitor fails to satisfy the equipment or other requirements for PCC or Open Division during the course of fire, he will shoot for no score.
Appendixes for Production, SS and CO all clearly state under section 20:
• Each magazine must be contained individually within the magazine pouch. Magazines may not be retained through magnetic means.
Since it clearly states in 188.8.131.52 that it is during the course of fire that a magazine cannot be retained by a magnet, I have to go with they can use it anytime before and after, but not during.