Reading that paper, it seems it solely comprises attaching sensors (I'd imagine piezo transducers bolted firmly onto measurement points, most likely) and listen

Reading that paper, it seems it solely comprises attaching sensors (I'd imagine piezo transducers bolted firmly onto measurement points, most likely) and listening - so it's hard to see how it could have had any effect, unless they attached the sensors with a method that would damage the bridge, which seems unlikely.