Seems like it. 10lbs second day weigh in. Same with Fielding. It´s the same as the IBF mandates for it´s title fights.
This was Golden Boy's doing. Let's see if Canelo has the same success without Oscar and his poltical team rigging the scales for their man.
Canelo "we prepared 6 weeks for a tall fighter like Callum Smith" Callum Smith "I have had only 4 weeks to prepare for the Canelo fight but I am in good shape".
Seems like Canelo is doing just fine rigging the scales himself. To answer the question, yes, there was a rehydration clause that was revealed on the day of the fight.
Callum Smith should have been preparing for this fight since the very first time his name was mentioned as a possible opponent last year, or at the very least since they went into negotiations. That is Smith's bad.