It's because the boxing world is awaiting for the Fury vs Wilder rematch. That's why there's no media attention on this fight. Besides, with Garcia coming off from a lost to Errol Spence and then Jessie Vargas somewhat lost in the 147 lbs division, it's really hard to promote this fight.
So for me, this two are just B-side boxers to the growing list of top welterweights around.
There's really no hype it is being eclipse by the Wilder and Fury match, everybody is tuned on this fight, because the first fight was excited and there's unfinished between the two, maybe after this fight and if no big fights coming up, medias will cover and hype this fight, but definitely this will have a hype in Mexico.