I doubt he'll ruin his name and career by not showing up for this fight. I know there are rumors regarding him faking the illness but if the WBO confirmed the evidence he showed, I believe that he was not faking his Illness.
It's not fake, it's real, otherwise, he will go to jail or will lose his license. Casimero has proven not feeling well that time so he was not stripped with this belt, for the 2nd time, he is given another chance to defend his title and I'm sure he will do just find and beat his challenger.
Casimero is on his way making his name to be more famous in the industry and I don't actually believe that he will do that because surely Casimero himself know what would be the outcome if he suddenly decides not to show up and it's just a rumor that he's just faking his illness that's why he was hospitalized but there's some videos in the youtube that can vouch his actions.
If I'm not mistaken, Casimero has history of having problems making the weight.
But I think this time there will be no slippage, because he knows that once he failed to show up or missed the weight in scale he will be strip of the belt on the fight night itself. So his team should really be careful of what he eat. Although there are still months before the actual fight. They should at least manage his weight by now, as early as they can so that there will be no cramping and huge drop in weight days before the fight because it will put a lot of strain in the body.
As for me, I have not remembered anything that he has a problem with weight before, I think that was the first time and that was just a rumor as the reason that was recognized by the organization on his absence is the "viral gastritis". If he fakes the justification of his absence, then most likely he will not succeed defending his title once the fight will happen.