People are mistaking cutting weight, I.e the type of weight you lose in the days before a fight (water weight) with losing weight, I.e the type of weight you lose permanently through altering your diet.
Cyborg needs to lose muscle mass. Her weight loss needs to be a permanent thing. I think the 'she will die' comments were in regards to if she tries to cut too much water weight.
Cyborg can make 135 if she does it the right way. To say she is too big is rubbish as she wouldn't be as big if she wasn't on the juice. No woman gets that big naturally.