It's illegal to deactivate safeties for IDPA competition.
While the guns are at chrono, they're boxed, weighed, and the safeties are inspected/tested (the KNOWN safeties. I very much dislike this part of any match, as it's usually a 1911 grip safety test, and little else).
Guns with "trigger safeties" - Glocks, M&Ps, etc. - are tested by very carefully pulling the trigger while avoiding the "safety" lever in the middle. If the striker falls, it's a fail.
It was determined that the safeties were defective, rather than having been "disabled", so both competitors were allowed to continue, with replacement guns.