Eh... it's meaningless, he's just tossing this out there as yet another excuse to blame his upcoming loss on.
Engagement farming, most likely, people no longer have to provide legitimate sources or context in their stories; they can post any old BS on social media, and people will retweet it, giving them the attention they crave.
Canelo aims for the shoulders and biceps more than he aims for the jaw these days. If true, good luck.