i was under the impression that if you made weight offstage, the scale on the stage doesn't matter. that scale only comes into play when you miss on backstage scale. remember one of the fighters missed and didn't say anything about stage scale, just the digital scale they gave him for his room and ones backstage were different.
asked the AIs, and they all said real weigh-ins happens offstage in private, but the ones with links didn't say that. then confuse weigh-ins off stage, on stage and the ceremonial weigh-in.
don't have time to dig into it more, but saw a comment on reddit saying the weigh was recorded backstage during a fight island behind the scenes.
also every chat i saw about this subject breaks down into conspiracy theories about ufc controlling the scales